12640431164 has 24 divisors (see below), whose sum is σ = 23221363200. Its totient is φ = 6012667440.

The previous prime is 12640431137. The next prime is 12640431179. The reversal of 12640431164 is 46113404621.

It is a self number, because there is not a number n which added to its sum of digits gives 12640431164.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 856574 + ... + 871205.

It is an arithmetic number, because the mean of its divisors is an integer number (967556800).

Almost surely, 2^12640431164 is an apocalyptic number.

It is an amenable number.

12640431164 is a deficient number, since it is larger than the sum of its proper divisors (10580932036).

12640431164 is a wasteful number, since it uses less digits than its factorization.

12640431164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1727873 (or 1727871 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

Adding to 12640431164 its reverse (46113404621), we get a palindrome (58753835785).

The spelling of 12640431164 in words is "twelve billion, six hundred forty million, four hundred thirty-one thousand, one hundred sixty-four".