Question

which is the biggest prime number

Answer 1

As of August 2017, the largest known prime number is 274,207,281 − 1, a number with22,338,618 digits. It was found in January 2016 by the Great Internet Mersenne Prime Search (GIMPS).

Answer 2

On Jan. 25, the largest known prime number, 257,885,161-1, was discovered on Great Internet Mersenne Prime Search (GIMPS) volunteer Curtis Cooper's computer. The new prime number, 2 multiplied by itself 57,885,161 times, less one, has 17,425,170 digits.