12566639 has 2 divisors, whose sum is σ = 12566640. Its totient is φ = 12566638.

The previous prime is 12566629. The next prime is 12566647. The reversal of 12566639 is 93666521.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12566639 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12566629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6283319 + 6283320.

It is an arithmetic number, because the mean of its divisors is an integer number (6283320).

Almost surely, 2^12566639 is an apocalyptic number.

12566639 is a deficient number, since it is larger than the sum of its proper divisors (1).

12566639 is an equidigital number, since it uses as much as digits as its factorization.

12566639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 38.

The square root of 12566639 is about 3544.9455567046. The cubic root of 12566639 is about 232.4911254176.

The spelling of 12566639 in words is "twelve million, five hundred sixty-six thousand, six hundred thirty-nine".