12564651252 has 24 divisors (see below), whose sum is σ = 29576969856. Its totient is φ = 4151152768.

The previous prime is 12564651251. The next prime is 12564651277. The reversal of 12564651252 is 25215646521.

It is a super-2 number, since 2×12564651252² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12564651252.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12564651251) 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, 4631628 + ... + 4634339.

It is an arithmetic number, because the mean of its divisors is an integer number (1232373744).

Almost surely, 2^12564651252 is an apocalyptic number.

12564651252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12564651252 is an abundant number, since it is smaller than the sum of its proper divisors (17012318604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12564651252 is a wasteful number, since it uses less digits than its factorization.

12564651252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9266087 (or 9266085 counting only the distinct ones).

The product of its digits is 144000, while the sum is 39.

The spelling of 12564651252 in words is "twelve billion, five hundred sixty-four million, six hundred fifty-one thousand, two hundred fifty-two".