12685256172 has 144 divisors (see below), whose sum is σ = 34237292544. Its totient is φ = 3953376000.

The previous prime is 12685256161. The next prime is 12685256179. The reversal of 12685256172 is 27165258621.

12685256172 is a `hidden beast` number, since 1 + 2 + 6 + 8 + 5 + 25 + 617 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (12685256179) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4894597 + ... + 4897187.

It is an arithmetic number, because the mean of its divisors is an integer number (237758976).

Almost surely, 2^12685256172 is an apocalyptic number.

12685256172 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 12685256172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17118646272).

12685256172 is an abundant number, since it is smaller than the sum of its proper divisors (21552036372).

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

12685256172 is a wasteful number, since it uses less digits than its factorization.

12685256172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2780 (or 2775 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The spelling of 12685256172 in words is "twelve billion, six hundred eighty-five million, two hundred fifty-six thousand, one hundred seventy-two".