57665161 has 4 divisors (see below), whose sum is σ = 57683524. Its totient is φ = 57646800.

The previous prime is 57665149. The next prime is 57665213. The reversal of 57665161 is 16156675.

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 2013561 + 55651600 = 1419^2 + 7460^2 .

It is a cyclic number.

It is not a de Polignac number, because 57665161 - 2¹¹ = 57663113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 57665161.

It is not an unprimeable number, because it can be changed into a prime (57662161) 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, 3150 + ... + 11191.

It is an arithmetic number, because the mean of its divisors is an integer number (14420881).

Almost surely, 2^57665161 is an apocalyptic number.

It is an amenable number.

57665161 is a deficient number, since it is larger than the sum of its proper divisors (18363).

57665161 is a wasteful number, since it uses less digits than its factorization.

57665161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18362.

The product of its digits is 37800, while the sum is 37.

The square root of 57665161 is about 7593.7580288023. The cubic root of 57665161 is about 386.3413291783.

The spelling of 57665161 in words is "fifty-seven million, six hundred sixty-five thousand, one hundred sixty-one".