12655512531 has 12 divisors (see below), whose sum is σ = 18315278280. Its totient is φ = 8420811360.

The previous prime is 12655512461. The next prime is 12655512557. The reversal of 12655512531 is 13521555621.

12655512531 is a `hidden beast` number, since 1 + 2 + 65 + 55 + 12 + 531 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-12655512531 is a prime.

It is a super-2 number, since 2×12655512531² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12655512031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1344801 + ... + 1354178.

It is an arithmetic number, because the mean of its divisors is an integer number (1526273190).

Almost surely, 2^12655512531 is an apocalyptic number.

12655512531 is a deficient number, since it is larger than the sum of its proper divisors (5659765749).

12655512531 is a wasteful number, since it uses less digits than its factorization.

12655512531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2699506 (or 2699503 counting only the distinct ones).

The product of its digits is 45000, while the sum is 36.

The spelling of 12655512531 in words is "twelve billion, six hundred fifty-five million, five hundred twelve thousand, five hundred thirty-one".