13663556 has 18 divisors (see below), whose sum is σ = 24281082. Its totient is φ = 6727680.

The previous prime is 13663501. The next prime is 13663577. The reversal of 13663556 is 65536631.

It can be written as a sum of positive squares in 3 ways, for example, as 5597956 + 8065600 = 2366^2 + 2840^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 20996 + ... + 21636.

It is an arithmetic number, because the mean of its divisors is an integer number (1348949).

Almost surely, 2^13663556 is an apocalyptic number.

It is an amenable number.

13663556 is a deficient number, since it is larger than the sum of its proper divisors (10617526).

13663556 is an equidigital number, since it uses as much as digits as its factorization.

13663556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791 (or 716 counting only the distinct ones).

The product of its digits is 48600, while the sum is 35.

The square root of 13663556 is about 3696.4247591423. The cubic root of 13663556 is about 239.0678891889.

The spelling of 13663556 in words is "thirteen million, six hundred sixty-three thousand, five hundred fifty-six".