8018018851

This number is a prime.

The first prime that results from applying the rules of writing numbers in the American system of large number terminology as set out in Conway and Guy's The Book of Numbers (Springer-Verlag, 1996, p. 15): "eight billion eighteen million eighteen thousand eight hundred and fifty-one." Neil Copeland has suggested that 8,000,000,081 comes earlier, based on the spelling "eight billion and eighty-one."