13656556 has 12 divisors (see below), whose sum is σ = 23924992. Its totient is φ = 6820848.

The previous prime is 13656551. The next prime is 13656557. The reversal of 13656556 is 65565631.

It is a happy number.

It is a super-2 number, since 2×13656556² = 373003043562272, which contains 22 as substring.

It is a zygodrome in base 5.

It is not an unprimeable number, because it can be changed into a prime (13656551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5626 + ... + 7678.

Almost surely, 2^13656556 is an apocalyptic number.

It is an amenable number.

13656556 is a deficient number, since it is larger than the sum of its proper divisors (10268436).

13656556 is a wasteful number, since it uses less digits than its factorization.

13656556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3720 (or 3718 counting only the distinct ones).

The product of its digits is 81000, while the sum is 37.

The square root of 13656556 is about 3695.4777769593. The cubic root of 13656556 is about 239.0270564538.

It can be divided in two parts, 1365 and 6556, that added together give a square (7921 = 89²).

The spelling of 13656556 in words is "thirteen million, six hundred fifty-six thousand, five hundred fifty-six".