12665564 has 12 divisors (see below), whose sum is σ = 22680504. Its totient is φ = 6185424.

The previous prime is 12665563. The next prime is 12665593. The reversal of 12665564 is 46556621.

It is a super-2 number, since 2×12665564² = 320833022876192, which contains 22 as substring.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12665563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36647 + ... + 36990.

It is an arithmetic number, because the mean of its divisors is an integer number (1890042).

Almost surely, 2^12665564 is an apocalyptic number.

It is an amenable number.

12665564 is a deficient number, since it is larger than the sum of its proper divisors (10014940).

12665564 is a wasteful number, since it uses less digits than its factorization.

12665564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73684 (or 73682 counting only the distinct ones).

The product of its digits is 43200, while the sum is 35.

The square root of 12665564 is about 3558.8711693457. The cubic root of 12665564 is about 233.0995908692.

The spelling of 12665564 in words is "twelve million, six hundred sixty-five thousand, five hundred sixty-four".