665005 has 16 divisors (see below), whose sum is σ = 886464. Its totient is φ = 474880.

The previous prime is 664997. The next prime is 665011. The reversal of 665005 is 500566.

665005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 665005 - 2³ = 664997 is a prime.

It is a Duffinian number.

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, 5829 + ... + 5941.

It is an arithmetic number, because the mean of its divisors is an integer number (55404).

2⁶⁶⁵⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

665005 is a deficient number, since it is larger than the sum of its proper divisors (221459).

665005 is a wasteful number, since it uses less digits than its factorization.

665005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 665005 is about 815.4783872059. The cubic root of 665005 is about 87.2854061112.

The spelling of 665005 in words is "six hundred sixty-five thousand, five".