13662557 has 2 divisors, whose sum is σ = 13662558. Its totient is φ = 13662556.

The previous prime is 13662527. The next prime is 13662581. The reversal of 13662557 is 75526631.

13662557 is nontrivially palindromic in base 11.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12432676 + 1229881 = 3526^2 + 1109^2 .

It is a cyclic number.

It is not a de Polignac number, because 13662557 - 2¹⁶ = 13597021 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 (13662527) 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, 6831278 + 6831279.

It is an arithmetic number, because the mean of its divisors is an integer number (6831279).

Almost surely, 2^13662557 is an apocalyptic number.

It is an amenable number.

13662557 is a deficient number, since it is larger than the sum of its proper divisors (1).

13662557 is an equidigital number, since it uses as much as digits as its factorization.

13662557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 35.

The square root of 13662557 is about 3696.2896260980. The cubic root of 13662557 is about 239.0620626275.

The spelling of 13662557 in words is "thirteen million, six hundred sixty-two thousand, five hundred fifty-seven".