13256566 has 16 divisors (see below), whose sum is σ = 22163760. Its totient is φ = 5909760.

The previous prime is 13256563. The next prime is 13256597. The reversal of 13256566 is 66565231.

It is a super-2 number, since 2×13256566² = 351473084224712, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13256563) 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 in 7 ways as a sum of consecutive naturals, for example, 9615 + ... + 10906.

It is an arithmetic number, because the mean of its divisors is an integer number (1385235).

Almost surely, 2^13256566 is an apocalyptic number.

13256566 is a deficient number, since it is larger than the sum of its proper divisors (8907194).

13256566 is a wasteful number, since it uses less digits than its factorization.

13256566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20559.

The product of its digits is 32400, while the sum is 34.

The square root of 13256566 is about 3640.9567423962. The cubic root of 13256566 is about 236.6702554064.

The spelling of 13256566 in words is "thirteen million, two hundred fifty-six thousand, five hundred sixty-six".