What is 100 to the 100th power?

It's a mighty big number. It's also more commonly represented as 10 to the power 101.

This number is greater than the current estimates of the number of elementary particles in the universe. That estimate is 10 to the power 80, for the total number of protons, electrons and neutrons in the universe.

A googol is 10 to the power 100. So 100 to the 100th power is ten times a googol.