1 is the loneliest number...but not the largest

Researchers at a Missouri university have identified the largest known prime number. ... The number that the team found is 9.1 million digits long. It is a Mersenne prime known as M30402457 -- that's 2 to the 30,402,457th power minus 1. ... "We're super excited," said Boone, a chemistry professor. "We've been looking for such a number for a long time."

Read more about this exciting number!