557665 has 4 divisors (see below), whose sum is σ = 669204. Its totient is φ = 446128.

The previous prime is 557663. The next prime is 557671. The reversal of 557665 is 566755.

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 82944 + 474721 = 288^2 + 689^2 .

It is a cyclic number.

It is not a de Polignac number, because 557665 - 2¹ = 557663 is a prime.

It is a Duffinian number.

557665 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 557665.

It is not an unprimeable number, because it can be changed into a prime (557663) 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, 55762 + ... + 55771.

It is an arithmetic number, because the mean of its divisors is an integer number (167301).

2⁵⁵⁷⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

557665 is a deficient number, since it is larger than the sum of its proper divisors (111539).

557665 is a wasteful number, since it uses less digits than its factorization.

557665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111538.

The product of its digits is 31500, while the sum is 34.

The square root of 557665 is about 746.7697101517. The cubic root of 557665 is about 82.3109844801.

The spelling of 557665 in words is "five hundred fifty-seven thousand, six hundred sixty-five".