31647...52511 (12978189-digits)

This number is a prime.

The first known prime with 10 million or more digits and was discovered by Edson Smith of UCLA and GIMPS on August 23, 2008. This long-awaited prime was reported on a computer named zeppelin.pic.ucla.edu, a Dell Optiplex 745 with an Intel® Core™ 2 Duo E6600 CPU running at 2.40 GHz.