12556643634530 has 16 divisors (see below), whose sum is σ = 22602189940920. Its totient is φ = 5022606031872.

The previous prime is 12556643634529. The next prime is 12556643634559. The reversal of 12556643634530 is 3543634665521.

It can be written as a sum of positive squares in 4 ways, for example, as 12510998593921 + 45645040609 = 3537089^2 + 213647^2 .

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, 5394239 + ... + 7362818.

Almost surely, 2^{12556643634530} is an apocalyptic number.

12556643634530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12556643634530 is a deficient number, since it is larger than the sum of its proper divisors (10045546306390).

12556643634530 is a wasteful number, since it uses less digits than its factorization.

12556643634530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12855493.

The product of its (nonzero) digits is 23328000, while the sum is 53.

The spelling of 12556643634530 in words is "twelve trillion, five hundred fifty-six billion, six hundred forty-three million, six hundred thirty-four thousand, five hundred thirty".