12566564 has 6 divisors (see below), whose sum is σ = 21991494. Its totient is φ = 6283280.

The previous prime is 12566557. The next prime is 12566591. The reversal of 12566564 is 46566521.

It can be written as a sum of positive squares in only one way, i.e., 11505664 + 1060900 = 3392^2 + 1030^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1570817 + ... + 1570824.

It is an arithmetic number, because the mean of its divisors is an integer number (3665249).

Almost surely, 2^12566564 is an apocalyptic number.

It is an amenable number.

12566564 is a deficient number, since it is larger than the sum of its proper divisors (9424930).

12566564 is a wasteful number, since it uses less digits than its factorization.

12566564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3141645 (or 3141643 counting only the distinct ones).

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

The square root of 12566564 is about 3544.9349782471. The cubic root of 12566564 is about 232.4906629002.

The spelling of 12566564 in words is "twelve million, five hundred sixty-six thousand, five hundred sixty-four".