12638861525 has 12 divisors (see below), whose sum is σ = 15673624800. Its totient is φ = 10110162480.

The previous prime is 12638861513. The next prime is 12638861539. The reversal of 12638861525 is 52516883621.

It is not a de Polignac number, because 12638861525 - 2²⁰ = 12637812949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12638861525.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 425096 + ... + 453854.

It is an arithmetic number, because the mean of its divisors is an integer number (1306135400).

Almost surely, 2^12638861525 is an apocalyptic number.

It is an amenable number.

12638861525 is a deficient number, since it is larger than the sum of its proper divisors (3034763275).

12638861525 is a wasteful number, since it uses less digits than its factorization.

12638861525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46348 (or 46343 counting only the distinct ones).

The product of its digits is 691200, while the sum is 47.

The spelling of 12638861525 in words is "twelve billion, six hundred thirty-eight million, eight hundred sixty-one thousand, five hundred twenty-five".