665285 has 16 divisors (see below), whose sum is σ = 864000. Its totient is φ = 490176.

The previous prime is 665279. The next prime is 665293. The reversal of 665285 is 582566.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 665285 - 2⁶ = 665221 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4391 + ... + 4539.

It is an arithmetic number, because the mean of its divisors is an integer number (54000).

2⁶⁶⁵²⁸⁵ is an apocalyptic number.

It is an amenable number.

665285 is a deficient number, since it is larger than the sum of its proper divisors (198715).

665285 is a wasteful number, since it uses less digits than its factorization.

665285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220.

The product of its digits is 14400, while the sum is 32.

The square root of 665285 is about 815.6500475081. The cubic root of 665285 is about 87.2976548834.

The spelling of 665285 in words is "six hundred sixty-five thousand, two hundred eighty-five".