57221365256 has 32 divisors (see below), whose sum is σ = 117232898400. Its totient is φ = 25967667840.

The previous prime is 57221365217. The next prime is 57221365259. The reversal of 57221365256 is 65256312275.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (57221365259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 470765 + ... + 579708.

It is an arithmetic number, because the mean of its divisors is an integer number (3663528075).

Almost surely, 2^57221365256 is an apocalyptic number.

It is an amenable number.

57221365256 is an abundant number, since it is smaller than the sum of its proper divisors (60011533144).

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

57221365256 is a wasteful number, since it uses less digits than its factorization.

57221365256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051109 (or 1051105 counting only the distinct ones).

The product of its digits is 756000, while the sum is 44.

The spelling of 57221365256 in words is "fifty-seven billion, two hundred twenty-one million, three hundred sixty-five thousand, two hundred fifty-six".