How Many Zeros Are in a Googolplex Number?

A googolplex is the number 10googol, or equivalently, 10. Written out in ordinary decimal notation, it is 1 followed by 10100 zeroes; that is, a 1 followed by a googol zeroes.

Can a googolplex be written down?

Kasner also coined the term googolplex. And how many zeros in a googolplex? A googolplex is a 1 followed by a googol of zeros. It’s impossible to write out, but in scientific notation it looks like 1 x 1010^100.

Graham’s number is also bigger than a googolplex, which Milton initially defined as a 1, followed by writing zeroes until you get tired, but is now commonly accepted to be 10googol=10(10100). Graham’s number is bigger than the googolplex.

How many light years are in a googolplex?

The googolplex is so large a number that it could not be written on a piece of paper stretching across the visible universe (some 1,000,000,000 light-years).

Almost inevitably, at this point someone proffers an even bigger number, “googolplex.” It is true that the word “googolplex” was coined to mean a one followed by a googol zeros. True enough, but there is nothing as large as infinity either: infinity is not a number. It denotes endlessness.