506665 has 4 divisors (see below), whose sum is σ = 608004. Its totient is φ = 405328.

The previous prime is 506663. The next prime is 506683. The reversal of 506665 is 566605.

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 322624 + 184041 = 568^2 + 429^2 .

It is a cyclic number.

It is not a de Polignac number, because 506665 - 2¹ = 506663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (506663) 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, 50662 + ... + 50671.

It is an arithmetic number, because the mean of its divisors is an integer number (152001).

2⁵⁰⁶⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

506665 is a deficient number, since it is larger than the sum of its proper divisors (101339).

506665 is a wasteful number, since it uses less digits than its factorization.

506665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101338.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 506665 is about 711.8040460689. The cubic root of 506665 is about 79.7211646816.

The spelling of 506665 in words is "five hundred six thousand, six hundred sixty-five".