56557222120 has 128 divisors (see below), whose sum is σ = 151273267200. Its totient is φ = 18621907200.

The previous prime is 56557222109. The next prime is 56557222129. The reversal of 56557222120 is 2122275565.

It is a self number, because there is not a number n which added to its sum of digits gives 56557222120.

It is not an unprimeable number, because it can be changed into a prime (56557222129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1112211 + ... + 1161949.

It is an arithmetic number, because the mean of its divisors is an integer number (1181822400).

Almost surely, 2^56557222120 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 56557222120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75636633600).

56557222120 is an abundant number, since it is smaller than the sum of its proper divisors (94716045080).

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

56557222120 is a wasteful number, since it uses less digits than its factorization.

56557222120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49919 (or 49915 counting only the distinct ones).

The product of its (nonzero) digits is 84000, while the sum is 37.

Adding to 56557222120 its reverse (2122275565), we get a palindrome (58679497685).

The spelling of 56557222120 in words is "fifty-six billion, five hundred fifty-seven million, two hundred twenty-two thousand, one hundred twenty".