Googolplex

A googolplex is the number 10^Googol(10¹⁰¹⁰⁰). A googolplex can not be written down. This is because there are not enough atoms in the universe to use to write it down on. In fact, it would take a trillion times more atoms to write down a googolplex. It was thought of by the nephew of mathematician Edward Kasner.

Google named their headquarters, Googleplex, after the googolplex.

Also see

• Graham's number