57155565 has 16 divisors (see below), whose sum is σ = 93921408. Its totient is φ = 29658816.

The previous prime is 57155563. The next prime is 57155573. The reversal of 57155565 is 56555175.

Added to its reverse (56555175) it gives a triangular number (113710740 = T₁₅₀₈₀).

It is not a de Polignac number, because 57155565 - 2¹ = 57155563 is a prime.

It is a super-2 number, since 2×57155565² = 6533517220938450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57155563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50937 + ... + 52046.

It is an arithmetic number, because the mean of its divisors is an integer number (5870088).

Almost surely, 2^57155565 is an apocalyptic number.

It is an amenable number.

57155565 is a deficient number, since it is larger than the sum of its proper divisors (36765843).

57155565 is a wasteful number, since it uses less digits than its factorization.

57155565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103028.

The product of its digits is 131250, while the sum is 39.

The square root of 57155565 is about 7560.1299592004. The cubic root of 57155565 is about 385.1999074263.

Adding to 57155565 its reverse (56555175), we get a triangular number (113710740 = T₁₅₀₈₀).

The spelling of 57155565 in words is "fifty-seven million, one hundred fifty-five thousand, five hundred sixty-five".