56661098656 has 48 divisors (see below), whose sum is σ = 117958595328. Its totient is φ = 26747942400.

The previous prime is 56661098639. The next prime is 56661098693. The reversal of 56661098656 is 65689016665.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 56661098656.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 655890 + ... + 737233.

It is an arithmetic number, because the mean of its divisors is an integer number (2457470736).

Almost surely, 2^56661098656 is an apocalyptic number.

It is an amenable number.

56661098656 is an abundant number, since it is smaller than the sum of its proper divisors (61297496672).

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

56661098656 is a wasteful number, since it uses less digits than its factorization.

56661098656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393205 (or 1393197 counting only the distinct ones).

The product of its (nonzero) digits is 13996800, while the sum is 58.

It can be divided in two parts, 5666109 and 8656, that added together give a palindrome (5674765).

The spelling of 56661098656 in words is "fifty-six billion, six hundred sixty-one million, ninety-eight thousand, six hundred fifty-six".