12566557 has 2 divisors, whose sum is σ = 12566558. Its totient is φ = 12566556.

The previous prime is 12566551. The next prime is 12566591. The reversal of 12566557 is 75566521.

12566557 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12467961 + 98596 = 3531^2 + 314^2 .

It is a cyclic number.

It is not a de Polignac number, because 12566557 - 2¹⁹ = 12042269 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 (12566551) 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, 6283278 + 6283279.

It is an arithmetic number, because the mean of its divisors is an integer number (6283279).

Almost surely, 2^12566557 is an apocalyptic number.

It is an amenable number.

12566557 is a deficient number, since it is larger than the sum of its proper divisors (1).

12566557 is an equidigital number, since it uses as much as digits as its factorization.

12566557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63000, while the sum is 37.

The square root of 12566557 is about 3544.9339909228. The cubic root of 12566557 is about 232.4906197318.

The spelling of 12566557 in words is "twelve million, five hundred sixty-six thousand, five hundred fifty-seven".