12531227166 has 24 divisors (see below), whose sum is σ = 27184584960. Its totient is φ = 4171907616.

The previous prime is 12531227161. The next prime is 12531227237. The reversal of 12531227166 is 66172213521.

12531227166 is a `hidden beast` number, since 12 + 5 + 312 + 271 + 66 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 12531227166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12531227161) 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, 415710 + ... + 444833.

It is an arithmetic number, because the mean of its divisors is an integer number (1132691040).

Almost surely, 2^12531227166 is an apocalyptic number.

12531227166 is an abundant number, since it is smaller than the sum of its proper divisors (14653357794).

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

12531227166 is a wasteful number, since it uses less digits than its factorization.

12531227166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861360 (or 861357 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The spelling of 12531227166 in words is "twelve billion, five hundred thirty-one million, two hundred twenty-seven thousand, one hundred sixty-six".