13656557 has 2 divisors, whose sum is σ = 13656558. Its totient is φ = 13656556.

The previous prime is 13656551. The next prime is 13656581. The reversal of 13656557 is 75565631.

13656557 is digitally balanced in base 2, 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., 9916201 + 3740356 = 3149^2 + 1934^2 .

It is a cyclic number.

It is not a de Polignac number, because 13656557 - 2¹⁰ = 13655533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13656557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13656551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6828278 + 6828279.

It is an arithmetic number, because the mean of its divisors is an integer number (6828279).

Almost surely, 2^13656557 is an apocalyptic number.

It is an amenable number.

13656557 is a deficient number, since it is larger than the sum of its proper divisors (1).

13656557 is an equidigital number, since it uses as much as digits as its factorization.

13656557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94500, while the sum is 38.

The square root of 13656557 is about 3695.4779122598. The cubic root of 13656557 is about 239.0270622881.

The spelling of 13656557 in words is "thirteen million, six hundred fifty-six thousand, five hundred fifty-seven".