12656663436 has 12 divisors (see below), whose sum is σ = 29532214712. Its totient is φ = 4218887808.

The previous prime is 12656663429. The next prime is 12656663441. The reversal of 12656663436 is 63436665621.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×12656663436² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 527360965 + ... + 527360988.

Almost surely, 2^12656663436 is an apocalyptic number.

It is an amenable number.

12656663436 is an abundant number, since it is smaller than the sum of its proper divisors (16875551276).

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

12656663436 is a wasteful number, since it uses less digits than its factorization.

12656663436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054721960 (or 1054721958 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 48.

The spelling of 12656663436 in words is "twelve billion, six hundred fifty-six million, six hundred sixty-three thousand, four hundred thirty-six".