13661816 has 32 divisors (see below), whose sum is σ = 30551040. Its totient is φ = 5599968.

The previous prime is 13661803. The next prime is 13661833. The reversal of 13661816 is 61816631.

13661816 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4016 + ... + 6591.

It is an arithmetic number, because the mean of its divisors is an integer number (954720).

Almost surely, 2^13661816 is an apocalyptic number.

It is an amenable number.

13661816 is an abundant number, since it is smaller than the sum of its proper divisors (16889224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13661816 is a wasteful number, since it uses less digits than its factorization.

13661816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10643 (or 10639 counting only the distinct ones).

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

The square root of 13661816 is about 3696.1893890871. The cubic root of 13661816 is about 239.0577406403.

The spelling of 13661816 in words is "thirteen million, six hundred sixty-one thousand, eight hundred sixteen".