56161108872 has 96 divisors (see below), whose sum is σ = 166409549280. Its totient is φ = 16969390080.

The previous prime is 56161108847. The next prime is 56161108921. The reversal of 56161108872 is 27880116165.

56161108872 is a `hidden beast` number, since 561 + 6 + 1 + 1 + 0 + 8 + 87 + 2 = 666.

It is a super-2 number, since 2×56161108872² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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, 172648 + ... + 377000.

It is an arithmetic number, because the mean of its divisors is an integer number (1733432805).

Almost surely, 2^56161108872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56161108872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83204774640).

56161108872 is an abundant number, since it is smaller than the sum of its proper divisors (110248440408).

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

56161108872 is a wasteful number, since it uses less digits than its factorization.

56161108872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204723 (or 204716 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 56161108872 in words is "fifty-six billion, one hundred sixty-one million, one hundred eight thousand, eight hundred seventy-two".