13568661 has 8 divisors (see below), whose sum is σ = 20101760. Its totient is φ = 9045756.

The previous prime is 13568627. The next prime is 13568707. The reversal of 13568661 is 16686531.

It is a happy number.

13568661 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13568661 - 2¹⁰ = 13567637 is a prime.

It is a super-2 number, since 2×13568661² = 368217122665842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13568161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251245 + ... + 251298.

It is an arithmetic number, because the mean of its divisors is an integer number (2512720).

Almost surely, 2^13568661 is an apocalyptic number.

It is an amenable number.

13568661 is a deficient number, since it is larger than the sum of its proper divisors (6533099).

13568661 is an equidigital number, since it uses as much as digits as its factorization.

13568661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502552 (or 502546 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 13568661 is about 3683.5663425545. The cubic root of 13568661 is about 238.5131514444.

The spelling of 13568661 in words is "thirteen million, five hundred sixty-eight thousand, six hundred sixty-one".