57191140865 has 4 divisors (see below), whose sum is σ = 68629369044. Its totient is φ = 45752912688.

The previous prime is 57191140861. The next prime is 57191140873. The reversal of 57191140865 is 56804119175.

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

It can be written as a sum of positive squares in 2 ways, for example, as 37604578561 + 19586562304 = 193919^2 + 139952^2 .

It is a cyclic number.

It is not a de Polignac number, because 57191140865 - 2² = 57191140861 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 (57191140861) 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, 5719114082 + ... + 5719114091.

It is an arithmetic number, because the mean of its divisors is an integer number (17157342261).

Almost surely, 2^57191140865 is an apocalyptic number.

It is an amenable number.

57191140865 is a deficient number, since it is larger than the sum of its proper divisors (11438228179).

57191140865 is a wasteful number, since it uses less digits than its factorization.

57191140865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11438228178.

The product of its (nonzero) digits is 302400, while the sum is 47.

The spelling of 57191140865 in words is "fifty-seven billion, one hundred ninety-one million, one hundred forty thousand, eight hundred sixty-five".