Googolplex
Name given to the number [latex]10^\textrm{googol}[/latex] or [latex]10^{10^{10}}[/latex].
The googolplex is a number defined as the number 10 raised to the power of googol.
It would be physically impossible, in the decimal system, to write this number on a sheet of paper as large as we could reasonably find, because it contains more digits than there are atoms in the visible universe.