**largest prime number yet.**

(He hasn't found

*the*largest prime as there is no such thing -- he's just found a new prime that is larger than any other primes people have found.)

It is a Mersenne prime, which means it is of the form

**2**, where P itself is prime. The one Cooper found is

^{P}− 1**2**, and it has

^{57,885,161}− 1**17 million digits!!**

**So no, I'm not going to type it out here! Writing it in the form 2**

^{57,885,161}− 1 is way handier, isn't it? Shows us how important exponents are. So, this new prime is 2 multiplied by itself 57,885,161 times, and then you subtract 1.

This is what Cooper himself says about the hunt for new primes:

"Every time I find one it is incredible," Cooper said. "I kind of consider it like climbing Mount Everest or finding a really rare diamond or landing somebody on the moon. It's an accomplishment. It's a scientific feat."

Read more: Missouri researchers ID largest prime number yet. If you wish to see the number, you can download a text file of it here.