12639915912 has 64 divisors (see below), whose sum is σ = 34860591360. Its totient is φ = 3794342400.

The previous prime is 12639915853. The next prime is 12639915943. The reversal of 12639915912 is 21951993621.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 481264 + ... + 506847.

It is an arithmetic number, because the mean of its divisors is an integer number (544696740).

Almost surely, 2^12639915912 is an apocalyptic number.

12639915912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12639915912 is an abundant number, since it is smaller than the sum of its proper divisors (22220675448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12639915912 is a wasteful number, since it uses less digits than its factorization.

12639915912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988174 (or 988170 counting only the distinct ones).

The product of its digits is 262440, while the sum is 48.

It can be divided in two parts, 126399 and 15912, that added together give a triangular number (142311 = T₅₃₃).

The spelling of 12639915912 in words is "twelve billion, six hundred thirty-nine million, nine hundred fifteen thousand, nine hundred twelve".