12666644 has 6 divisors (see below), whose sum is σ = 22166634. Its totient is φ = 6333320.

The previous prime is 12666607. The next prime is 12666671. The reversal of 12666644 is 44666621.

It can be written as a sum of positive squares in only one way, i.e., 11478544 + 1188100 = 3388^2 + 1090^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1583327 + ... + 1583334.

It is an arithmetic number, because the mean of its divisors is an integer number (3694439).

Almost surely, 2^12666644 is an apocalyptic number.

It is an amenable number.

12666644 is a deficient number, since it is larger than the sum of its proper divisors (9499990).

12666644 is a wasteful number, since it uses less digits than its factorization.

12666644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3166665 (or 3166663 counting only the distinct ones).

The product of its digits is 41472, while the sum is 35.

The square root of 12666644 is about 3559.0228996173. The cubic root of 12666644 is about 233.1062161934.

The spelling of 12666644 in words is "twelve million, six hundred sixty-six thousand, six hundred forty-four".