57161665 has 16 divisors (see below), whose sum is σ = 75378240. Its totient is φ = 41267520.

The previous prime is 57161651. The next prime is 57161669. The reversal of 57161665 is 56616175.

57161665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-57161665 is a prime.

It is not an unprimeable number, because it can be changed into a prime (57161669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3907 + ... + 11383.

It is an arithmetic number, because the mean of its divisors is an integer number (4711140).

Almost surely, 2^57161665 is an apocalyptic number.

57161665 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

57161665 is a deficient number, since it is larger than the sum of its proper divisors (18216575).

57161665 is a wasteful number, since it uses less digits than its factorization.

57161665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7632.

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

The square root of 57161665 is about 7560.5333806551. The cubic root of 57161665 is about 385.2136105880.

Subtracting from 57161665 its reverse (56616175), we obtain a triangular number (545490 = T₁₀₄₄).

It can be divided in two parts, 5716 and 1665, that added together give a triangular number (7381 = T₁₂₁).

The spelling of 57161665 in words is "fifty-seven million, one hundred sixty-one thousand, six hundred sixty-five".