12656331664 has 40 divisors (see below), whose sum is σ = 25066833120. Its totient is φ = 6188587008.

The previous prime is 12656331631. The next prime is 12656331719. The reversal of 12656331664 is 46613365621.

It is a self number, because there is not a number n which added to its sum of digits gives 12656331664.

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, 147459 + ... + 216925.

It is an arithmetic number, because the mean of its divisors is an integer number (626670828).

Almost surely, 2^12656331664 is an apocalyptic number.

It is an amenable number.

12656331664 is a deficient number, since it is larger than the sum of its proper divisors (12410501456).

12656331664 is a wasteful number, since it uses less digits than its factorization.

12656331664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69727 (or 69721 counting only the distinct ones).

The product of its digits is 466560, while the sum is 43.

The spelling of 12656331664 in words is "twelve billion, six hundred fifty-six million, three hundred thirty-one thousand, six hundred sixty-four".