57137821812 has 36 divisors (see below), whose sum is σ = 144439023456. Its totient is φ = 19044977040.

The previous prime is 57137821789. The next prime is 57137821817. The reversal of 57137821812 is 21812873175.

57137821812 is a `hidden beast` number, since 57 + 1 + 378 + 218 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57137821817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1243593 + ... + 1288719.

It is an arithmetic number, because the mean of its divisors is an integer number (4012195096).

Almost surely, 2^57137821812 is an apocalyptic number.

It is an amenable number.

57137821812 is an abundant number, since it is smaller than the sum of its proper divisors (87301201644).

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

57137821812 is a wasteful number, since it uses less digits than its factorization.

57137821812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80308 (or 80303 counting only the distinct ones).

The product of its digits is 188160, while the sum is 45.

The spelling of 57137821812 in words is "fifty-seven billion, one hundred thirty-seven million, eight hundred twenty-one thousand, eight hundred twelve".