12656631968 has 12 divisors (see below), whose sum is σ = 24917744250. Its totient is φ = 6328315968.

The previous prime is 12656631961. The next prime is 12656631973. The reversal of 12656631968 is 86913665621.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 8388361744 + 4268270224 = 91588^2 + 65332^2 .

It is not an unprimeable number, because it can be changed into a prime (12656631961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197759843 + ... + 197759906.

Almost surely, 2^12656631968 is an apocalyptic number.

It is an amenable number.

12656631968 is a deficient number, since it is larger than the sum of its proper divisors (12261112282).

12656631968 is an equidigital number, since it uses as much as digits as its factorization.

12656631968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395519759 (or 395519751 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 53.

The spelling of 12656631968 in words is "twelve billion, six hundred fifty-six million, six hundred thirty-one thousand, nine hundred sixty-eight".