12639945984 has 72 divisors (see below), whose sum is σ = 33658548000. Its totient is φ = 4211079168.

The previous prime is 12639945959. The next prime is 12639946001. The reversal of 12639945984 is 48954993621.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2108239 + ... + 2114225.

Almost surely, 2^12639945984 is an apocalyptic number.

It is an amenable number.

12639945984 is an abundant number, since it is smaller than the sum of its proper divisors (21018602016).

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

12639945984 is an equidigital number, since it uses as much as digits as its factorization.

12639945984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8755 (or 8741 counting only the distinct ones).

The product of its digits is 16796160, while the sum is 60.

The spelling of 12639945984 in words is "twelve billion, six hundred thirty-nine million, nine hundred forty-five thousand, nine hundred eighty-four".