12656331536 has 10 divisors (see below), whose sum is σ = 24521642382. Its totient is φ = 6328165760.

The previous prime is 12656331473. The next prime is 12656331559. The reversal of 12656331536 is 63513365621.

It can be written as a sum of positive squares in only one way, i.e., 10080160000 + 2576171536 = 100400^2 + 50756^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12656331493 and 12656331502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 395510345 + ... + 395510376.

Almost surely, 2^12656331536 is an apocalyptic number.

12656331536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12656331536 is a deficient number, since it is larger than the sum of its proper divisors (11865310846).

12656331536 is an equidigital number, since it uses as much as digits as its factorization.

12656331536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791020729 (or 791020723 counting only the distinct ones).

The product of its digits is 291600, while the sum is 41.

The spelling of 12656331536 in words is "twelve billion, six hundred fifty-six million, three hundred thirty-one thousand, five hundred thirty-six".