12131773656 has 32 divisors (see below), whose sum is σ = 30344771760. Its totient is φ = 4041879552.

The previous prime is 12131773651. The next prime is 12131773669. The reversal of 12131773656 is 65637713121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131773651) 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, 78985 + ... + 174648.

Almost surely, 2^12131773656 is an apocalyptic number.

It is an amenable number.

12131773656 is an abundant number, since it is smaller than the sum of its proper divisors (18212998104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12131773656 is a wasteful number, since it uses less digits than its factorization.

12131773656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255635 (or 255631 counting only the distinct ones).

The product of its digits is 158760, while the sum is 42.

The spelling of 12131773656 in words is "twelve billion, one hundred thirty-one million, seven hundred seventy-three thousand, six hundred fifty-six".