# Graham’s Number

## It’s pretty big.

7–11–16, Leif finds number, Adil is inspired by cool fact and reports

There is a huge number called Graham’s number. Far bigger than googolplex if y’all know of that. Graham’s number is “so large that the observable universe is far too small to contain an ordinary digital representation of Graham’s number, assuming that each digit occupies one Planck volume, possibly the smallest measurable space.” So you obviously can’t write out all of it’s digits… but you also can’t even write it in scientific notation. To write it, you have to use Knuth’s up-arrow notation. For the easiest explanation of this funky notation, check out this link.

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