56161609280 has 112 divisors (see below), whose sum is σ = 152959954176. Its totient is φ = 19240273920.

The previous prime is 56161609261. The next prime is 56161609289. The reversal of 56161609280 is 8290616165.

It is a tau number, because it is divible by the number of its divisors (112).

It is not an unprimeable number, because it can be changed into a prime (56161609289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3052910 + ... + 3071250.

Almost surely, 2^56161609280 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 56161609280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76479977088).

56161609280 is an abundant number, since it is smaller than the sum of its proper divisors (96798344896).

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

56161609280 is a wasteful number, since it uses less digits than its factorization.

56161609280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19732 (or 19722 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 56161609280 in words is "fifty-six billion, one hundred sixty-one million, six hundred nine thousand, two hundred eighty".