11666961 has 12 divisors (see below), whose sum is σ = 17433780. Its totient is φ = 7509600.

The previous prime is 11666953. The next prime is 11666971. The reversal of 11666961 is 16966611.

It can be written as a sum of positive squares in 2 ways, for example, as 1838736 + 9828225 = 1356^2 + 3135^2 .

It is not a de Polignac number, because 11666961 - 2³ = 11666953 is a prime.

It is a super-2 number, since 2×11666961² = 272235957951042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11666971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22090 + ... + 22611.

It is an arithmetic number, because the mean of its divisors is an integer number (1452815).

Almost surely, 2^11666961 is an apocalyptic number.

It is an amenable number.

11666961 is a deficient number, since it is larger than the sum of its proper divisors (5766819).

11666961 is a wasteful number, since it uses less digits than its factorization.

11666961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44736 (or 44733 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 11666961 is about 3415.6933410363. The cubic root of 11666961 is about 226.8049778216.

The spelling of 11666961 in words is "eleven million, six hundred sixty-six thousand, nine hundred sixty-one".