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 2 curios for this number that have not yet been approved by an editor.)

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