12665644 has 6 divisors (see below), whose sum is σ = 22164884. Its totient is φ = 6332820.

The previous prime is 12665641. The next prime is 12665651. The reversal of 12665644 is 44656621.

It is not an unprimeable number, because it can be changed into a prime (12665641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1583202 + ... + 1583209.

Almost surely, 2^12665644 is an apocalyptic number.

It is an amenable number.

12665644 is a deficient number, since it is larger than the sum of its proper divisors (9499240).

12665644 is a wasteful number, since it uses less digits than its factorization.

12665644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3166415 (or 3166413 counting only the distinct ones).

The product of its digits is 34560, while the sum is 34.

The square root of 12665644 is about 3558.8824088469. The cubic root of 12665644 is about 233.1000816469.

The spelling of 12665644 in words is "twelve million, six hundred sixty-five thousand, six hundred forty-four".