12564636631 has 8 divisors (see below), whose sum is σ = 12591159840. Its totient is φ = 12538142592.

The previous prime is 12564636619. The next prime is 12564636649. The reversal of 12564636631 is 13663646521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12564636631 - 2⁷ = 12564636503 is a prime.

It is a super-2 number, since 2×12564636631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12564636611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 994651 + ... + 1007203.

It is an arithmetic number, because the mean of its divisors is an integer number (1573894980).

Almost surely, 2^12564636631 is an apocalyptic number.

12564636631 is a deficient number, since it is larger than the sum of its proper divisors (26523209).

12564636631 is a wasteful number, since it uses less digits than its factorization.

12564636631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14585.

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

The spelling of 12564636631 in words is "twelve billion, five hundred sixty-four million, six hundred thirty-six thousand, six hundred thirty-one".