57187115921 has 16 divisors (see below), whose sum is σ = 61877345040. Its totient is φ = 52538891520.

The previous prime is 57187115891. The next prime is 57187115939. The reversal of 57187115921 is 12951178175.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1661377600 + 55525738321 = 40760^2 + 235639^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57187115921 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (57187115941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3702611 + ... + 3718023.

It is an arithmetic number, because the mean of its divisors is an integer number (3867334065).

Almost surely, 2^57187115921 is an apocalyptic number.

It is an amenable number.

57187115921 is a deficient number, since it is larger than the sum of its proper divisors (4690229119).

57187115921 is a wasteful number, since it uses less digits than its factorization.

57187115921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16756.

The product of its digits is 176400, while the sum is 47.

The spelling of 57187115921 in words is "fifty-seven billion, one hundred eighty-seven million, one hundred fifteen thousand, nine hundred twenty-one".