The first myriad digits of \(2 \uparrow\uparrow 6 \) are shown below (see also googolgong factorial):
\(2120038728808211984885164691662274630835654230675372483625951752354414565561161
\)\(04070877100880693221397373830232858761785630767043029687717518073544568734772
\)\(72177105989977302549029956203307888156682312598118679770733517094990154117112
\)\(52084773542860000470477034485144800115984333252764409276046381713259634691302
\)\(75393067820911873615552142820914047285895765387570650403282986217299590984295
\)\(88641477006173623661654095331865260477959968829846060286438432594070021533230
\)\(590603934497899498907787777415054577390945611947042009962883128483426450559585 \)\(5834596821195753982821841057864428619929163132202731092742038121326247072362740 \)\(6987511744565318590294898916306152457294383684351371005215226543074880076159823 \)\(1341046508807950343453365161264586815723094847328560763832688195454894962671586 \)\(3591958245810579103465848226129385044898325146594588320813977901106535370887956 \)\(6218287616373575257021092759151574842538122538577129494188801432499660869402904 \)\(5463418804239477581187690391956487380768998663011696483289178535744737613275626 \)\(6388953546099944746837549294167800942402604296883648748786097985742159245618717 \)\(2340828449333981357570738181470650933405852978730682588006888490058920581332716 \)\(9139412614862610957599481061404782768173632281717274420521565669998228913335453 \)\(2458102292101395018138465309795752816469439909183669852221669849990368637410188 \)\(0961830877780271231527232172711924947906935405785588041860744783534419740293207 \)\(6849619961907608810597359907372093081376485525309215979474218490174334598678011 \)\(2153433406505933807068657047050926644557680245144012007482707724330947218617656 \)\(2674080637059073697336882357986692984091160846061588266481346808601069577823224 \)\(3811583919941499514477841933044293410051463253530624969231358911270315801003144 \)\(8688597113493007593928840598955997896917289081296747919096385769113144366183069 \)\(8150987919813405242840749482088459753546381588662453109107325417133966545517063 \)\(7531370070560043559384767688734481567309035888561527201398638632491917626738058 \)\(9542977312119613143460836956672279918555910573897339600049853118121934316976517 \)\(7351558349552606265584948663959116238166834400481403972633061506276594825435361 \)\(0024054443568968907672276710885902898255907206061272233890758698526828054314010 \)\(8811481323661704468618902303928079814964572592957804885093952246320116230529603 \)\(0646303725871604837062127067865068433707326976300878627871192455196632283146246 \)\(3927095952026200977465525006320710066444225441843276179978566480957183534774916 \)\(7078513003638514812985074808709163614072175417331614717944143379555420906009038 \)\(5380435716731251653453198938649131519036752608026269680543911702341322391096539 \)\(7228862303600380982595030523402305701157512293994665222975487401625717423366245 \)\(0569355420702037537762906577158099769964660403497282794369225628520320832050754 \)\(8432829672243463021983169026975325635513832863371716464075688462449962002301868 \)\(0555145058792610876377648982193285423072407044649791331856257757503754613417379 \)\(1792006033141594847064668454244184559494152119079670899647588089025955140058319 \)\(4850020688300337031603699199018391684011350437884541678055982755076140427808495 \)\(7766909150370491242944695826714404651962759992227204839012741924784107879524745 \)\(6201788123022845576969571319538500083806742237127606749695107640246453209126377 \)\(9394381742086260698917214068738307816347801627356013555416111066313667130318792 \)\(6353871546437852030423647268448878717822728382386460588096783972306567690633189 \)\(1609413219883105911622893098035539899571349523148901444015100968458498535352596 \)\(0914778398914452678308062447617180450913474985921161833573676899422524648374764 \)\(7275430036182889253890932422215622713587388754787557172787575036556620281535842 \)\(2226113768398683549898874088350666499804343816427614154709867425969889355505405 \)\(2876695946736902203219418783188113357260540244527911977568951031465358692015545 \)\(3586233127152194394678906923732321656363857121848902540502817931088707891277900 \)\(3384984969556475228718122764136963090456926755888570391170143546941813980756567 \)\(1927586451488669136398987167044168467883724426644845065062713440070016707431104 \)\(0714485976932040417997871270260883927386758162769902588525776765947369393486103 \)\(1050528956383406000029106571457919637670340884971964847992371462529479840284651 \)\(2183242020931449628512972680316415131457069182065618010771427554508040431365026 \)\(0278531083677947204322715745115591132803957665993125851545756845827551053235977 \)\(6618387679070101027194283292204841139964694985405713710484256797124885605588310 \)\(1750069353013566546984673624426713092126003514439655543566432826912974178223374 \)\(6980077130205568863279051783599822871037339680359797842862982631968920240440559 \)\(4597777727818537641779324278533779655772789619596597029558851940753493776206810 \)\(2359339128168911385036628681774728430335642624930144696507217131741349820477695 \)\(4685055348370047591628333961804045701625096015631324587300203439996579081346561 \)\(3271742588533064038386990944748006132417033269296180121562021495127677069936768 \)\(4839786335491108595021798343616287825417980851034238792450391960339324259296309 \)\(7256846450668362570996274012976528447191934789056540912901161843313431063235506 \)\(8116420672262742521981989193903798301100502560974989046238776665405897869412777 \)\(8572117326401718600614015405836222890224309004642724311809300102151040464880170 \)\(7594871717032168515462842994932424752467343325733561193971138555883079500126829 \)\(3450709438041283256229811563050133370336168454540186943219025123889118011303817 \)\(3096809830913363605305234431980011180953984895504265080144289376508155755883535 \)\(5619043189530337158159706842779624671095510641820198159990811713109367700793678 \)\(5280750959125502129877902941953015938303237753202237347858485347999773817745152 \)\(2261555545085907576786771516179064792167267116312301297366061464196347798225657 \)\(5583606045096231013844490369563672775540218926746543656571519251215176858458876 \)\(3607908080747012471708903366978977956869077688213617860761387416395308507452480 \)\(4084424645212667612030327533614311612346767502793611161818771783320111266503099 \)\(5093883550297135245890746456979235837304538135621697617890937314723196994711674 \)\(8775010071195999529681069633046079212308400791471631074672496217963034979170101 \)\(5575604243999939199310190258725496461844908024244387106139284224034666569060939 \)\(8375937777846466378013921703417136179374656817259204340641250068976118004995720 \)\(0373601196645266106449966497812886849957851877987255818508749167417438523667365 \)\(3568843212737013676294144801775160629611669983787241987239455234071119273548870 \)\(2562095514182855466584255487916169320678564576529189001686039355709861734627246 \)\(7195785981746220262809265403215116285065107695196152496250341798437468932668865 \)\(4300717760710316909358237403083223231873897515692284510482303036391186909794070 \)\(5836479517624570464855471344640433258991066815637473827102230522746856085446363 \)\(4353408901862403406832205880225878301303811520941241968978820081277602722880865 \)\(6364001710785582072667221451482352966164803476833510307106938900438854378916610 \)\(5439836698807557540874014566320818964329859266996879477039355029189593368180093 \)\(6613509587503527439624308867268441031329239768924582857907530261660129198745258 \)\(4466320387767342969259936732911997998551932067505226723774941958199963165877204 \)\(9183000915957064444709435193831519199051298156943163357742479119170699997903825 \)\(6517019978955162333361896792722799465939498374270884143109772741585523009465496 \)\(6625992087299012794272247874024719822864892434373312701889626280926838611664382 \)\(8725853856535875663758775710787332035836120927619763322362538210359964628822635 \)\(2474047800568104652462927518152970320576985311583435493525651994033350534042990 \)\(5149226004457245372672923839296272470844579829609202881772750070090906651080053 \)\(3577000542250160755912918608454131852480057481908323845892140115350553304986736 \)\(3895911767293056085236152738408158534122705161959313894133674751524486802774321 \)\(8908529106336101889672714037568110386945447383404820822965978732518406748303708 \)\(5294130910741036206713526199737871991645510607891872081100583140328943397578476 \)\(5875960579074760786718014264439053227332717696191945959247459041285046553016608 \)\(8167774236816175889107399705590127742944185051338518867404535823136979558600186 \)\(9108927174946366732960643764873507705609415813958296136813734989974680384890290 \)\(7302695356004033720495168847762558360226386684461570444552709840842478589573101 \)\(5354040774035557722447842709643273105558166701147588297021235159262194300320257 \)\(4078605856584059981099730219183891201186940946719368721169631635573134342065534 \)\(2201330247727514523017226570361449618612101547236403147856239466389874465131665 \)\(8739694820389256899199545502743711867390646154226420204029389466172959584775119 \)\(1376910756355994550841704367129157718146634179075940168005542772692378441143434 \)\(7111283562334589404455473246538903892067830796694107227541081741794989203978038 \)\(6257322444739900319395462786102381409133627373757195895350446489282144121518620 \)\(2806060544313749979566508452158778984087813144845556833192026234784597274786069 \)\(7153029054757028094875954277257294439436011982837365778222757928058492895838609 \)\(8086070972403227919183220695085844556675327126946231411981231989063053738474651 \)\(3545844157003470913185089890538973707995816318912052760519793998660309896530949 \)\(4632661182046899680139543513831758356157623621919426567898401793622726774328728 \)\(1327985018513878511842943545809342011132798475073225012988516664521835302230354 \)\(1082989720852779649040010856822235884466042995686164639515601369171522834337112 \)\(3073438434794453927688045427296867585765873166344434190912679415087018454262103 \)\(9064256750960065507774423608167931157714189808003154066339876152228180153572845 \)\(0008380000077790083171860584200717032626395822117829792196946901568034703477851 \)\(4137632865495985378762703567537838835866418893823436927631724092039487623827321 \)\(8326373765106758423508867871142665251193990369795324874185178408874509722644888 \)\(4477605923585497070020219131919019470737328529927320403173996361758457052648971 \)\(6946833348657107657716359479228454557768237555642762998717726030854273264660518 \)\(1840487981551310136363597286373659441248315787677448471224830222587936566785919 \)\(816114522669267681473560423538335071783870753554244457298...\)
Computed on the alpertron calculator.