to obtain this number you first take the number of ways to arrange 6 objects 720=6!-=6*5*4*3*2*1
you then take 6! and factorial that number (720) to get 6!!
you then take 6!! and double how many factorial signs they are to make 6!!!!
you then add another ! sign to make 6!!!!!
after that you double the number of !'s again to get 6!!!!!!!! you then repeated this process of doubling the number of ! signs until you have doubled it 2^10^20^40^80^7687 number of times. Now that's big.