12568657 has 2 divisors, whose sum is σ = 12568658. Its totient is φ = 12568656.

The previous prime is 12568643. The next prime is 12568667. The reversal of 12568657 is 75686521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11316496 + 1252161 = 3364^2 + 1119^2 .

It is an emirp because it is prime and its reverse (75686521) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12568657 is a prime.

It is a super-2 number, since 2×12568657² = 315942277567298, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12568667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6284328 + 6284329.

It is an arithmetic number, because the mean of its divisors is an integer number (6284329).

Almost surely, 2^12568657 is an apocalyptic number.

It is an amenable number.

12568657 is a deficient number, since it is larger than the sum of its proper divisors (1).

12568657 is an equidigital number, since it uses as much as digits as its factorization.

12568657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 40.

The square root of 12568657 is about 3545.2301758842. The cubic root of 12568657 is about 232.5035695293.

It can be divided in two parts, 12568 and 657, that added together give a square (13225 = 115²).

The spelling of 12568657 in words is "twelve million, five hundred sixty-eight thousand, six hundred fifty-seven".