On Jan. 25, 2013, 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.
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As of August 2017, the largest known prime number is 2^74,207,281 − 1, a number with 22,338,618digits.
As of August 2017, the largest known prime number is 2^74,207,281 − 1, a number with 22,338,618digits.
As of January 2017 , the largest known prime number is 2^74,207,281 − 1, a number with 22,338,618 digits.
It has been proven that there is no largest prime number. You can find a list of the largest KNOWN prime numbers here: http://en.wikipedia.org/wiki/Largest_known_prime_number
As of October 2015, the largest known prime number is 2^57,885,161 − 1, a number with 17,425,170 digits.