12917573172 has 120 divisors (see below), whose sum is σ = 38788534400. Its totient is φ = 3672060480.

The previous prime is 12917573171. The next prime is 12917573281. The reversal of 12917573172 is 27137571921.

12917573172 is a `hidden beast` number, since 1 + 2 + 9 + 1 + 7 + 573 + 1 + 72 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12917573171) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 437022 + ... + 465642.

Almost surely, 2^12917573172 is an apocalyptic number.

12917573172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12917573172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19394267200).

12917573172 is an abundant number, since it is smaller than the sum of its proper divisors (25870961228).

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

12917573172 is a wasteful number, since it uses less digits than its factorization.

12917573172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28843 (or 28832 counting only the distinct ones).

The product of its digits is 185220, while the sum is 45.

The spelling of 12917573172 in words is "twelve billion, nine hundred seventeen million, five hundred seventy-three thousand, one hundred seventy-two".