# What number is googolplex

## Googolplexplex

A **Googolplexplex** is a number so high that it needs an explanation:

The number 10^{100} (a number with 100 zeros) is called googol. Written out, this number looks like this:

10 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000

Quite unspectacular - but there is an improvement:

The number 10 to the power of 10 to the power of 100 is called the Googolplex (a number followed by Googol with lots of zeros!). This number is higher than the number of all atoms in the entire universe that is believed by today's scientists! Just to write out this number in the same type and font size as above (just to write it out!), We would need a monitor with a width of about 10^{74} times the diameter of our current universe.

A **Googolplexplex** (10 to the power of 10 to the power of 10 to the power of 100) is called the number 10^{Googolplex}. That should be a number with the unimaginable number of again Googolplex many zeros!

### How it all started:

In the 1930s, the American mathematician Edward Kasner had the idea of inventing a number that would surpass anything people can imagine. He asked his 9-year-old nephew what name he would give to a very high number. The boy called it "Googol". Another mathematician later invented the "Googolplex" and defined it as a 10^{Googol}.

A Googol is actually nothing special. The total number of elementary particles in the known universe is estimated to be about 10^{80} estimated. If the universe were completely filled with neutrons so that no empty space existed, there would be about 10^{128} Particle. That is much more than a googol. But one cannot imagine the dimensions of a googolplex and neither can a googolplex, a number with a googolplex with many zeros.

By the way: The well-known company Google derived its name from “Googol”.

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