11511666 has 32 divisors (see below), whose sum is σ = 26467200. Its totient is φ = 3704400.

The previous prime is 11511623. The next prime is 11511679. The reversal of 11511666 is 66611511.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2110 + ... + 5241.

It is an arithmetic number, because the mean of its divisors is an integer number (827100).

Almost surely, 2^11511666 is an apocalyptic number.

11511666 is an abundant number, since it is smaller than the sum of its proper divisors (14955534).

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

11511666 is a wasteful number, since it uses less digits than its factorization.

11511666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7391 (or 7385 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 11511666 is about 3392.8846134226. The cubic root of 11511666 is about 225.7941713326.

It can be divided in two parts, 115 and 11666, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 11511666 in words is "eleven million, five hundred eleven thousand, six hundred sixty-six".