665579 has 8 divisors (see below), whose sum is σ = 702000. Its totient is φ = 630112.

The previous prime is 665573. The next prime is 665591. The reversal of 665579 is 975566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 665579 - 2⁴ = 665563 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1517 + ... + 1905.

It is an arithmetic number, because the mean of its divisors is an integer number (87750).

2⁶⁶⁵⁵⁷⁹ is an apocalyptic number.

665579 is a deficient number, since it is larger than the sum of its proper divisors (36421).

665579 is a wasteful number, since it uses less digits than its factorization.

665579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477.

The product of its digits is 56700, while the sum is 38.

The square root of 665579 is about 815.8302519520. The cubic root of 665579 is about 87.3105123960.

It can be divided in two parts, 66557 and 9, that added together give a palindrome (66566).

The spelling of 665579 in words is "six hundred sixty-five thousand, five hundred seventy-nine".