12664566 has 16 divisors (see below), whose sum is σ = 28143600. Its totient is φ = 4221504.

The previous prime is 12664549. The next prime is 12664579. The reversal of 12664566 is 66546621.

It is a happy number.

12664566 is a `hidden beast` number, since 1 + 2 + 6 + 645 + 6 + 6 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 12664566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117211 + ... + 117318.

It is an arithmetic number, because the mean of its divisors is an integer number (1758975).

Almost surely, 2^12664566 is an apocalyptic number.

12664566 is an abundant number, since it is smaller than the sum of its proper divisors (15479034).

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

12664566 is a wasteful number, since it uses less digits than its factorization.

12664566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234540 (or 234534 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 12664566 is about 3558.7309535844. The cubic root of 12664566 is about 233.0934682440.

It can be divided in two parts, 1266 and 4566, that added together give a cube (5832 = 18³).

The spelling of 12664566 in words is "twelve million, six hundred sixty-four thousand, five hundred sixty-six".