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largest prime number...!! Shafer of Michigan SU.
The number is 6,320,430 digits long and it need 1,500 pages to write out. It is more than two million digits larger than the previous largest known prime number.
It is one of the Mersenne primes. Mersenne primes are a special category, expressed as 2 to the "p" power minus 1, where "p" also is a prime number.
In the case of Shafer's discovery, it was 2 to the 20,996,011th power minus 1. It is the 40th known Mersenne prime.
for sure, I can't write it on this screen
want to find next largest prime.. check out .. http://www.mersenne.org/prime.htm