20996011
This number is a prime.
On 17 November 2003, Michael Shafer's computer found the 40th known Mersenne prime (2^20996011 - 1). This number "weighs in" at a whopping 6320430 decimal digits! This is also the largest known prime number, surpassing GIMPS' last discovery by over 2 million digits.
(There are 3 curios for this number that have not yet been approved by an editor.)
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell