56555516664 has 96 divisors (see below), whose sum is σ = 155848492800. Its totient is φ = 18524600640.

The previous prime is 56555516657. The next prime is 56555516681. The reversal of 56555516664 is 46661555565.

It is a self number, because there is not a number n which added to its sum of digits gives 56555516664.

It is a congruent number.

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, 1176607 + ... + 1223729.

It is an arithmetic number, because the mean of its divisors is an integer number (1623421800).

Almost surely, 2^56555516664 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 56555516664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77924246400).

56555516664 is an abundant number, since it is smaller than the sum of its proper divisors (99292976136).

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

56555516664 is a wasteful number, since it uses less digits than its factorization.

56555516664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47425 (or 47418 counting only the distinct ones).

The product of its digits is 16200000, while the sum is 54.

The spelling of 56555516664 in words is "fifty-six billion, five hundred fifty-five million, five hundred sixteen thousand, six hundred sixty-four".