13601665 has 40 divisors (see below), whose sum is σ = 20973888. Its totient is φ = 8396640.

The previous prime is 13601647. The next prime is 13601689. The reversal of 13601665 is 56610631.

13601665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13601665 - 2⁵ = 13601633 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 132004 + ... + 132106.

Almost surely, 2^13601665 is an apocalyptic number.

It is an amenable number.

13601665 is a deficient number, since it is larger than the sum of its proper divisors (7372223).

13601665 is an equidigital number, since it uses as much as digits as its factorization.

13601665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 13601665 is about 3688.0435192660. The cubic root of 13601665 is about 238.7063789170.

It can be divided in two parts, 1360 and 1665, that added together give a square (3025 = 55²).

The spelling of 13601665 in words is "thirteen million, six hundred one thousand, six hundred sixty-five".