11665816 has 16 divisors (see below), whose sum is σ = 22138200. Its totient is φ = 5762304.

The previous prime is 11665813. The next prime is 11665817. The reversal of 11665816 is 61856611.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11665813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8121 + ... + 9448.

Almost surely, 2^11665816 is an apocalyptic number.

It is an amenable number.

11665816 is a deficient number, since it is larger than the sum of its proper divisors (10472384).

11665816 is a wasteful number, since it uses less digits than its factorization.

11665816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17658 (or 17654 counting only the distinct ones).

The product of its digits is 8640, while the sum is 34.

The square root of 11665816 is about 3415.5257282006. The cubic root of 11665816 is about 226.7975580032.

The spelling of 11665816 in words is "eleven million, six hundred sixty-five thousand, eight hundred sixteen".