Ron Charlton's Big License Plate Number

Googolplex is a one followed by googol zeros. Googol is a one followed by one hundred zeros. Googleplex can also be written as 10¹⁰¹⁰⁰.

If you wanted to write googolplex as numerals, and you could write a zero on every sub-atomic particle in the known universe, you would run out of particles long before you could write all the zeros.

(Note: Infinity is not a number.)