11666665 has 16 divisors (see below), whose sum is σ = 14829120. Its totient is φ = 8786880.

The previous prime is 11666663. The next prime is 11666689. The reversal of 11666665 is 56666611.

It is not a de Polignac number, because 11666665 - 2¹ = 11666663 is a prime.

It is a super-2 number, since 2×11666665² = 272222144444450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11666663) 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, 21295 + ... + 21835.

It is an arithmetic number, because the mean of its divisors is an integer number (926820).

Almost surely, 2^11666665 is an apocalyptic number.

It is an amenable number.

11666665 is a deficient number, since it is larger than the sum of its proper divisors (3162455).

11666665 is a wasteful number, since it uses less digits than its factorization.

11666665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792.

The product of its digits is 38880, while the sum is 37.

The square root of 11666665 is about 3415.6500113448. The cubic root of 11666665 is about 226.8030597316.

The spelling of 11666665 in words is "eleven million, six hundred sixty-six thousand, six hundred sixty-five".