12172176560520 has 96 divisors (see below), whose sum is σ = 39560184420120. Its totient is φ = 3245863649280.

The previous prime is 12172176560503. The next prime is 12172176560549. The reversal of 12172176560520 is 2506567127121.

12172176560520 is a `hidden beast` number, since 1 + 2 + 1 + 7 + 2 + 1 + 7 + 65 + 60 + 520 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 11544351699204 + 627824861316 = 3397698^2 + 792354^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27063880 + ... + 27509960.

Almost surely, 2^{12172176560520} is an apocalyptic number.

12172176560520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12172176560520 is an abundant number, since it is smaller than the sum of its proper divisors (27388007859600).

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

12172176560520 is a wasteful number, since it uses less digits than its factorization.

12172176560520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521895 (or 521888 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 45.

The spelling of 12172176560520 in words is "twelve trillion, one hundred seventy-two billion, one hundred seventy-six million, five hundred sixty thousand, five hundred twenty".