11566681 has 24 divisors (see below), whose sum is σ = 14587776. Its totient is φ = 8951040.

The previous prime is 11566673. The next prime is 11566691. The reversal of 11566681 is 18666511.

It is not a de Polignac number, because 11566681 - 2³ = 11566673 is a prime.

It is a super-2 number, since 2×11566681² = 267576218711522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11566601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 162876 + ... + 162946.

It is an arithmetic number, because the mean of its divisors is an integer number (607824).

Almost surely, 2^11566681 is an apocalyptic number.

It is an amenable number.

11566681 is a deficient number, since it is larger than the sum of its proper divisors (3021095).

11566681 is an equidigital number, since it uses as much as digits as its factorization.

11566681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169 (or 132 counting only the distinct ones).

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

The square root of 11566681 is about 3400.9823580842. The cubic root of 11566681 is about 226.1532948538.

The spelling of 11566681 in words is "eleven million, five hundred sixty-six thousand, six hundred eighty-one".