The largest known prime number is   2^{57,885,161} { -1
2 3 2

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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!
3 3 3