11656001631 has 4 divisors (see below), whose sum is σ = 15541335512. Its totient is φ = 7770667752.

The previous prime is 11656001629. The next prime is 11656001659. The reversal of 11656001631 is 13610065611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13610065611 = 3 ⋅4536688537.

It is not a de Polignac number, because 11656001631 - 2¹ = 11656001629 is a prime.

It is a super-2 number, since 2×11656001631² (a number of 21 digits) 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 (11656001531) 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, 1942666936 + ... + 1942666941.

It is an arithmetic number, because the mean of its divisors is an integer number (3885333878).

Almost surely, 2^11656001631 is an apocalyptic number.

11656001631 is a deficient number, since it is larger than the sum of its proper divisors (3885333881).

11656001631 is an equidigital number, since it uses as much as digits as its factorization.

11656001631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3885333880.

The product of its (nonzero) digits is 3240, while the sum is 30.

The spelling of 11656001631 in words is "eleven billion, six hundred fifty-six million, one thousand, six hundred thirty-one".