12661731631 has 16 divisors (see below), whose sum is σ = 13994640000. Its totient is φ = 11404730880.

The previous prime is 12661731601. The next prime is 12661731659. The reversal of 12661731631 is 13613716621.

It is a cyclic number.

It is not a de Polignac number, because 12661731631 - 2⁷ = 12661731503 is a prime.

It is a super-2 number, since 2×12661731631² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12661731601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126631 + ... + 203368.

It is an arithmetic number, because the mean of its divisors is an integer number (874665000).

Almost surely, 2^12661731631 is an apocalyptic number.

12661731631 is a deficient number, since it is larger than the sum of its proper divisors (1332908369).

12661731631 is a wasteful number, since it uses less digits than its factorization.

12661731631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330114.

The product of its digits is 27216, while the sum is 37.

The spelling of 12661731631 in words is "twelve billion, six hundred sixty-one million, seven hundred thirty-one thousand, six hundred thirty-one".