57665565 has 12 divisors (see below), whose sum is σ = 99953724. Its totient is φ = 30754944.

The previous prime is 57665527. The next prime is 57665567. The reversal of 57665565 is 56556675.

It can be written as a sum of positive squares in 2 ways, for example, as 30008484 + 27657081 = 5478^2 + 5259^2 .

It is not a de Polignac number, because 57665565 - 2¹⁷ = 57534493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1281457 = 57665565 / (5 + 7 + 6 + 6 + 5 + 5 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 57665565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57665567) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 640684 + ... + 640773.

It is an arithmetic number, because the mean of its divisors is an integer number (8329477).

Almost surely, 2^57665565 is an apocalyptic number.

It is an amenable number.

57665565 is a deficient number, since it is larger than the sum of its proper divisors (42288159).

57665565 is a wasteful number, since it uses less digits than its factorization.

57665565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281468 (or 1281465 counting only the distinct ones).

The product of its digits is 945000, while the sum is 45.

The square root of 57665565 is about 7593.7846295507. The cubic root of 57665565 is about 386.3422314072.

It can be divided in two parts, 5 and 7665565, that added together give a triangular number (7665570 = T₃₉₁₅).

The spelling of 57665565 in words is "fifty-seven million, six hundred sixty-five thousand, five hundred sixty-five".