12865855009564 has 12 divisors (see below), whose sum is σ = 22515441849544. Its totient is φ = 6432871623984.

The previous prime is 12865855009529. The next prime is 12865855009621. The reversal of 12865855009564 is 46590055856821.

It is a hoax number, since the sum of its digits (64) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 12865855009496 and 12865855009505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13450014 + ... + 14374789.

Almost surely, 2^{12865855009564} is an apocalyptic number.

It is an amenable number.

12865855009564 is a deficient number, since it is larger than the sum of its proper divisors (9649586839980).

12865855009564 is a wasteful number, since it uses less digits than its factorization.

12865855009564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27940404 (or 27940402 counting only the distinct ones).

The product of its (nonzero) digits is 103680000, while the sum is 64.

The spelling of 12865855009564 in words is "twelve trillion, eight hundred sixty-five billion, eight hundred fifty-five million, nine thousand, five hundred sixty-four".