57047291991 has 24 divisors (see below), whose sum is σ = 82846275200. Its totient is φ = 37826456976.

The previous prime is 57047291981. The next prime is 57047292013. The reversal of 57047291991 is 19919274075.

57047291991 is a `hidden beast` number, since 5 + 70 + 472 + 9 + 19 + 91 = 666.

It is not a de Polignac number, because 57047291991 - 2¹⁰ = 57047290967 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57047291981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7595460 + ... + 7602966.

Almost surely, 2^57047291991 is an apocalyptic number.

57047291991 is a deficient number, since it is larger than the sum of its proper divisors (25798983209).

57047291991 is a wasteful number, since it uses less digits than its factorization.

57047291991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11955 (or 11952 counting only the distinct ones).

The product of its (nonzero) digits is 1428840, while the sum is 54.

The spelling of 57047291991 in words is "fifty-seven billion, forty-seven million, two hundred ninety-one thousand, nine hundred ninety-one".