Question

biggest prime number disovered

Answer 1

The largest known prime number is $2^{57,885,161} {$ -1

Answer 2

The largest(biggest) prime number ever known is " 2⁵⁷,⁸⁸⁵,¹⁶¹ -1 " (Its 2 multiplied by itself 57,885,161 times, less one)
This number is said to have 17,425,170 digits!