11656656166531 has 4 divisors (see below), whose sum is σ = 11656979343352. Its totient is φ = 11656332989712.

The previous prime is 11656656166517. The next prime is 11656656166541. The reversal of 11656656166531 is 13566165665611.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11656656166531 - 2⁵ = 11656656166499 is a prime.

It is a super-2 number, since 2×11656656166531² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11656656166511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161534301 + ... + 161606446.

It is an arithmetic number, because the mean of its divisors is an integer number (2914244835838).

Almost surely, 2^{11656656166531} is an apocalyptic number.

11656656166531 is a deficient number, since it is larger than the sum of its proper divisors (323176821).

11656656166531 is an equidigital number, since it uses as much as digits as its factorization.

11656656166531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323176820.

The product of its digits is 17496000, while the sum is 58.

The spelling of 11656656166531 in words is "eleven trillion, six hundred fifty-six billion, six hundred fifty-six million, one hundred sixty-six thousand, five hundred thirty-one".