11666631 has 8 divisors (see below), whose sum is σ = 15917440. Its totient is φ = 7596792.

The previous prime is 11666621. The next prime is 11666647. The reversal of 11666631 is 13666611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11666631 - 2²¹ = 9569479 is a prime.

It is a super-2 number, since 2×11666631² = 272220557780322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11666621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45091 + ... + 45348.

It is an arithmetic number, because the mean of its divisors is an integer number (1989680).

Almost surely, 2^11666631 is an apocalyptic number.

11666631 is a deficient number, since it is larger than the sum of its proper divisors (4250809).

11666631 is an equidigital number, since it uses as much as digits as its factorization.

11666631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90485.

The product of its digits is 3888, while the sum is 30.

The square root of 11666631 is about 3415.6450342505. The cubic root of 11666631 is about 226.8028394084.

The spelling of 11666631 in words is "eleven million, six hundred sixty-six thousand, six hundred thirty-one".