665265 has 8 divisors (see below), whose sum is σ = 1064448. Its totient is φ = 354800.

The previous prime is 665251. The next prime is 665267. The reversal of 665265 is 562566.

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

It is not a de Polignac number, because 665265 - 2⁵ = 665233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665267) 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, 22161 + ... + 22190.

It is an arithmetic number, because the mean of its divisors is an integer number (133056).

2⁶⁶⁵²⁶⁵ is an apocalyptic number.

It is an amenable number.

665265 is a deficient number, since it is larger than the sum of its proper divisors (399183).

665265 is a wasteful number, since it uses less digits than its factorization.

665265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44359.

The product of its digits is 10800, while the sum is 30.

The square root of 665265 is about 815.6377872561. The cubic root of 665265 is about 87.2967800851.

The spelling of 665265 in words is "six hundred sixty-five thousand, two hundred sixty-five".