12564163556 has 24 divisors (see below), whose sum is σ = 25807473216. Its totient is φ = 5239110240.

The previous prime is 12564163541. The next prime is 12564163561. The reversal of 12564163556 is 65536146521.

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, 6062750 + ... + 6064821.

It is an arithmetic number, because the mean of its divisors is an integer number (1075311384).

Almost surely, 2^12564163556 is an apocalyptic number.

It is an amenable number.

12564163556 is an abundant number, since it is smaller than the sum of its proper divisors (13243309660).

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

12564163556 is a wasteful number, since it uses less digits than its factorization.

12564163556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12127619 (or 12127617 counting only the distinct ones).

The product of its digits is 648000, while the sum is 44.

The spelling of 12564163556 in words is "twelve billion, five hundred sixty-four million, one hundred sixty-three thousand, five hundred fifty-six".