57505661931 has 4 divisors (see below), whose sum is σ = 76674215912. Its totient is φ = 38337107952.

The previous prime is 57505661929. The next prime is 57505661957. The reversal of 57505661931 is 13916650575.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 57505661931 - 2¹ = 57505661929 is a prime.

It is a super-2 number, since 2×57505661931² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57505661131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9584276986 + ... + 9584276991.

It is an arithmetic number, because the mean of its divisors is an integer number (19168553978).

Almost surely, 2^57505661931 is an apocalyptic number.

57505661931 is a deficient number, since it is larger than the sum of its proper divisors (19168553981).

57505661931 is a wasteful number, since it uses less digits than its factorization.

57505661931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19168553980.

The product of its (nonzero) digits is 850500, while the sum is 48.

The spelling of 57505661931 in words is "fifty-seven billion, five hundred five million, six hundred sixty-one thousand, nine hundred thirty-one".