12886638636 has 24 divisors (see below), whose sum is σ = 30578466240. Its totient is φ = 4222740112.

The previous prime is 12886638601. The next prime is 12886638649. The reversal of 12886638636 is 63683668821.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9100026 + ... + 9101441.

It is an arithmetic number, because the mean of its divisors is an integer number (1274102760).

Almost surely, 2^12886638636 is an apocalyptic number.

It is an amenable number.

12886638636 is an abundant number, since it is smaller than the sum of its proper divisors (17691827604).

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

12886638636 is a wasteful number, since it uses less digits than its factorization.

12886638636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18201533 (or 18201531 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 57.

The spelling of 12886638636 in words is "twelve billion, eight hundred eighty-six million, six hundred thirty-eight thousand, six hundred thirty-six".