57221618500 has 24 divisors (see below), whose sum is σ = 124972015896. Its totient is φ = 22888647200.

The previous prime is 57221618479. The next prime is 57221618507. The reversal of 57221618500 is 581612275.

It can be written as a sum of positive squares in 4 ways, for example, as 10762402564 + 46459215936 = 103742^2 + 215544^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 57221618500.

It is not an unprimeable number, because it can be changed into a prime (57221618507) 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 7 ways as a sum of consecutive naturals, for example, 57221119 + ... + 57222118.

It is an arithmetic number, because the mean of its divisors is an integer number (5207167329).

Almost surely, 2^57221618500 is an apocalyptic number.

57221618500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

57221618500 is an abundant number, since it is smaller than the sum of its proper divisors (67750397396).

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

57221618500 is a wasteful number, since it uses less digits than its factorization.

57221618500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114443256 (or 114443244 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 37.

The spelling of 57221618500 in words is "fifty-seven billion, two hundred twenty-one million, six hundred eighteen thousand, five hundred".