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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8243 is a prime number, but there is no greatest prime number.
43 is the greatest prime number of 860
well in the number 7493 the number 7 is the greatest prime number
There is no such thing as a largest prime number as there are infinitely many, but the largest known prime is a Mersenne Prime (one less than a power of two) - 257,885,161- 1.
The greatest prime number below 25 is 23.