56556536840 has 64 divisors (see below), whose sum is σ = 129924345600. Its totient is φ = 22152033792.

The previous prime is 56556536833. The next prime is 56556536983. The reversal of 56556536840 is 4863565565.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 336209 + ... + 475551.

It is an arithmetic number, because the mean of its divisors is an integer number (2030067900).

Almost surely, 2^56556536840 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 56556536840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64962172800).

56556536840 is an abundant number, since it is smaller than the sum of its proper divisors (73367808760).

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

56556536840 is a wasteful number, since it uses less digits than its factorization.

56556536840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139566 (or 139562 counting only the distinct ones).

The product of its (nonzero) digits is 12960000, while the sum is 53.

The spelling of 56556536840 in words is "fifty-six billion, five hundred fifty-six million, five hundred thirty-six thousand, eight hundred forty".