57315109831521 has 16 divisors (see below), whose sum is σ = 80969000208768. Its totient is φ = 35938621395200.

The previous prime is 57315109831493. The next prime is 57315109831561. The reversal of 57315109831521 is 12513890151375.

It is a cyclic number.

It is not a de Polignac number, because 57315109831521 - 2²² = 57315105637217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (57315109831561) 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, 371804370 + ... + 371958491.

It is an arithmetic number, because the mean of its divisors is an integer number (5060562513048).

Almost surely, 2^{57315109831521} is an apocalyptic number.

57315109831521 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

57315109831521 is a deficient number, since it is larger than the sum of its proper divisors (23653890377247).

57315109831521 is a wasteful number, since it uses less digits than its factorization.

57315109831521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743764392.

The product of its (nonzero) digits is 1134000, while the sum is 51.

Adding to 57315109831521 its reverse (12513890151375), we get a palindrome (69828999982896).

The spelling of 57315109831521 in words is "fifty-seven trillion, three hundred fifteen billion, one hundred nine million, eight hundred thirty-one thousand, five hundred twenty-one".