13618661 has 16 divisors (see below), whose sum is σ = 16339200. Its totient is φ = 11104128.

The previous prime is 13618613. The next prime is 13618667. The reversal of 13618661 is 16681631.

It is not a de Polignac number, because 13618661 - 2⁶ = 13618597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13618667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14360 + ... + 15278.

It is an arithmetic number, because the mean of its divisors is an integer number (1021200).

Almost surely, 2^13618661 is an apocalyptic number.

It is an amenable number.

13618661 is a deficient number, since it is larger than the sum of its proper divisors (2720539).

13618661 is an equidigital number, since it uses as much as digits as its factorization.

13618661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028.

The product of its digits is 5184, while the sum is 32.

The square root of 13618661 is about 3690.3470026544. The cubic root of 13618661 is about 238.8057629496.

The spelling of 13618661 in words is "thirteen million, six hundred eighteen thousand, six hundred sixty-one".