13665564 has 48 divisors (see below), whose sum is σ = 38653440. Its totient is φ = 4140720.

The previous prime is 13665563. The next prime is 13665571. The reversal of 13665564 is 46556631.

13665564 is a `hidden beast` number, since 1 + 36 + 65 + 564 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13665563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4564 + ... + 6939.

It is an arithmetic number, because the mean of its divisors is an integer number (805280).

Almost surely, 2^13665564 is an apocalyptic number.

It is an amenable number.

13665564 is an abundant number, since it is smaller than the sum of its proper divisors (24987876).

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

13665564 is a wasteful number, since it uses less digits than its factorization.

13665564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11527 (or 11519 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 13665564 is about 3696.6963629706. The cubic root of 13665564 is about 239.0795997765.

The spelling of 13665564 in words is "thirteen million, six hundred sixty-five thousand, five hundred sixty-four".