Integral-exaundevigintile

The integral-exaundevigintile is equal to (10^18-1)/19. It was coined by Andre Joyce.

Etymology

"integral" floors "exaundevigintile" where "exa" is 10^18 and "undevigintile" = 1/19.

http://michaelhalm.tripod.com/mathematics_beyond_the_googol.htm