It would fill 20,000 pages in a book. Another way to write this number is 2 136,279,841 – 1. There are a few special things about it. First, it's a prime number (meaning it is only divisible by ...

Prime numbers larger than 5 have to end in a 1, 3, 7, or 9: Numbers that end with an even digit are divisible by 2 and therefore not prime, and numbers with a final digit of 5 are divisible by 5.

In context: Prime numbers are those divisible only by 1 and themselves and include mathematical oddballs like 2, 3, 5, 7, and 11 ... This 41-million-digit number is the 52nd known "Mersenne ...