56855537920 has 144 divisors (see below), whose sum is σ = 140480686080. Its totient is φ = 22030589952.

The previous prime is 56855537909. The next prime is 56855537951. The reversal of 56855537920 is 2973555865.

It is a Smith number, since the sum of its digits (55) 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 15 ways as a sum of consecutive naturals, for example, 11316529 + ... + 11321551.

It is an arithmetic number, because the mean of its divisors is an integer number (975560320).

Almost surely, 2^56855537920 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 56855537920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70240343040).

56855537920 is an abundant number, since it is smaller than the sum of its proper divisors (83625148160).

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

56855537920 is a wasteful number, since it uses less digits than its factorization.

56855537920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5320 (or 5306 counting only the distinct ones).

The product of its (nonzero) digits is 11340000, while the sum is 55.

The spelling of 56855537920 in words is "fifty-six billion, eight hundred fifty-five million, five hundred thirty-seven thousand, nine hundred twenty".