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The ecetonplex (also called a centillionplex) is equal to E303#2 = EE303 = 1010303, using Hyper-E notation.[1][2] The name was coined by Sbiis Saibian. It is equal to 1 followed by a centillion zeroes. It is much larger than a googolplex. In fact an ecetonplex is greater than a googolplex raised to the power of a googol, which is (1010100)10100 = 1010200 (also known as gargoogol-plexed). It is 10303+1 digits long.

When Sbiis Saibian was young, he called this number centillionillion.[3] It is the only name for a large number he came up with during his childhood. Note that "centillionillion" is not a technically accurate name for this number; logically, "centillionillion" should mean the centillionth -illion, or 103*10303+3 (also called mehectillion). Sbiis Saibian himself notes this on his website.

Written out in decimal form ecetonplex is:

101000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

Writing down the full decimal expansion would take 10297 books of 400 pages each, with 2,500 digits on each page.

Ecetonplex is also known as "ten trecentretriginmillia^100trecentretriginmillia^99trecentretriginmillia^98trecentretriginmillia^97trecentretriginmillia^96trecentretriginmillia^95trecentretriginmillia^94trecentretriginmillia^93trecentretriginmillia^92trecentretriginmillia^91trecentretriginmillia^90trecentretriginmillia^89trecentretriginmillia^88trecentretriginmillia^87trecentretriginmillia^86trecentretriginmillia^85trecentretriginmillia^84trecentretriginmillia^83trecentretriginmillia^82trecentretriginmillia^81trecentretriginmillia^80trecentretriginmillia^79trecentretriginmillia^78trecentretriginmillia^77trecentretriginmillia^76trecentretriginmillia^75trecentretriginmillia^74trecentretriginmillia^73trecentretriginmillia^72trecentretriginmillia^71trecentretriginmillia^70trecentretriginmillia^69trecentretriginmillia^68trecentretriginmillia^67trecentretriginmillia^66trecentretriginmillia^65trecentretriginmillia^64trecentretriginmillia^63trecentretriginmillia^62trecentretriginmillia^61trecentretriginmillia^60trecentretriginmillia^59trecentretriginmillia^58trecentretriginmillia^57trecentretriginmillia^56trecentretriginmillia^55trecentretriginmillia^54trecentretriginmillia^53trecentretriginmillia^52trecentretriginmillia^51trecentretriginmillia^50trecentretriginmillia^49trecentretriginmillia^48trecentretriginmillia^47trecentretriginmillia^46trecentretriginmillia^45trecentretriginmillia^44trecentretriginmillia^43trecentretriginmillia^42trecentretriginmillia^41trecentretriginmillia^40trecentretriginmillia^39trecentretriginmillia^38trecentretriginmillia^37trecentretriginmillia^36trecentretriginmillia^35trecentretriginmillia^34trecentretriginmillia^33trecentretriginmillia^32trecentretriginmillia^31trecentretriginmillia^30trecentretriginmillia^29trecentretriginmillia^28trecentretriginmillia^27trecentretriginmillia^26trecentretriginmillia^25trecentretriginmillia^24trecentretriginmillia^23trecentretriginmillia^22trecentretriginmillia^21trecentretriginmillia^20trecentretriginmillia^19trecentretriginmillia^18trecentretriginmillia^17trecentretriginmillia^16trecentretriginmillia^15trecentretriginmillia^14trecentretriginmillia^13trecentretriginmillia^12trecentretriginmillia^11trecentretriginmillia^10trecentretriginmillia^9trecentretriginmillia^8trecentretriginmillia^7trecentretriginmillia^6trecentretriginmillia^5trecentretriginmillia^4trecentretriginmillia^3trecentretriginmillia^2trecentretriginmilliatrecenduotrigintillion" according to Landon Curt Noll's The English name of a number.

## Approximations

Notation Lower bound Upper bound
Arrow notation $$10\uparrow10\uparrow303$$
Down-arrow notation $$10\downarrow\downarrow304$$
Steinhaus-Moser Notation 140[3][3] 141[3][3]
Copy notation 9[9[303]] 1[10[152]]
H* function H(333H(99)) H(334H(99))
Taro's multivariable Ackermann function A(3,A(3,1005)) A(3,A(3,1006))
Pound-Star Notation #*((1))*((1))*9 #*((1))*((2))*9
BEAF {10,{10,303}}
Bashicu matrix system (0)(1)[1003] (0)(1)[1004]
Hyperfactorial array notation (167!)! (168!)!
Fast-growing hierarchy $$f_2(f_2(998))$$ $$f_2(f_2(999))$$
Hardy hierarchy $$H_{\omega^22}(998)$$ $$H_{\omega^22}(999)$$
Slow-growing hierarchy $$g_{\omega^{\omega^{\omega^23+3}}}(10)$$

## Sources

1. Hyper-E Numbers - Large Numbers by Sbiis Saibian
2. Sbiis Saibian's Ultimate Large Numbers List
3. https://sites.google.com/site/largenumbers/home/4-3/foray A 2nd Grader's Close Encounter with the Infinite - Large Numbers by Sbiis Saibian

Main article: centillion
Eceton series: eceton (= centillion) · ecetonplex · ecetonduplex · ecetontriplex · ecetonquadriplex · ecetonquintiplex
Ecetondex series: ecetondex · ecetondudex · ecetontridex · ecetonquadridex · ecetonquintidex
Ecetonthrex series: ecetonthrex · ecetonduthrex
Ecetontetrex series: ecetontetrex · ecetondutetrex
Ecetonpentex series: ecetonpentex · ecetondupentex
Ecetonhex series: ecetonhex · ecetonduhex
Ecetonheptex series: ecetonheptex · ecetonduheptex
Ecetonoctex series: ecetonoctex · ecetonduoctex
-minutia group
n-ary numbers with multipliers
Eyelash mite group: eyelash mite-speck · eyelash mite-crumb · eyelash mite-chunk · (binary/ternary/octal)eyelash mite · eyelash mite-bunch · eyelash mite-crowd · eyelash mite-swarm
Dust mite group: dust mite-speck · dust mite-crumb · dust mite-chunk · (binary/ternary/octal)dust mite · dust mite-bunch · dust mite-crowd · dust mite-swarm
Cheese mite group: cheese mite-speck · cheese mite-crumb · cheese mite-chunk · (binary/ternary/octal)cheese mite · cheese mite-bunch · cheese mite-crowd · cheese mite-swarm
Clover mite group: clover mite-speck · clover mite-crumb · clover mite-chunk · (binary/ternary/octal)clover mite · clover mite-bunch · clover mite-crowd · clover mite-swarm
Pipsqueak group: (binary/ternary/octal)pipsqueak
Little squeaker group: (binary/ternary/octal)little squeaker
Small fry group: (binary/ternary/octal)small fry
Guppy group: (binary/ternary/octal)guppyspeck · (binary/ternary/octal)guppycrumb · (binary/ternary/octal)guppychunk · (ternary/quaternary/quinary/duodecimal/hexadecimal/vigesimal/sexagesimal)guppy(bit/byte)
Minnow group: (binary/ternary/octal)minnowspeck · (binary/ternary/octal)minnowcrumb · (binary/ternary/octal)minnowchunk · (ternary)minnow(bit/byte)
Goby group: (binary/ternary/octal)gobyspeck · (binary/ternary/octal)gobycrumb · (binary/ternary/octal)gobychunk · (ternary)goby(bit/byte)