12565504404 has 30 divisors (see below), whose sum is σ = 32848711434. Its totient is φ = 4188501360.

The previous prime is 12565504387. The next prime is 12565504429. The reversal of 12565504404 is 40440556521.

12565504404 is a `hidden beast` number, since 1 + 2 + 565 + 50 + 4 + 40 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 9676656900 + 2888847504 = 98370^2 + 53748^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 19390887 + ... + 19391534.

Almost surely, 2^12565504404 is an apocalyptic number.

It is an amenable number.

12565504404 is an abundant number, since it is smaller than the sum of its proper divisors (20283207030).

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

12565504404 is a wasteful number, since it uses less digits than its factorization.

12565504404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38782437 (or 38782426 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 36.

The spelling of 12565504404 in words is "twelve billion, five hundred sixty-five million, five hundred four thousand, four hundred four".