665255 has 4 divisors (see below), whose sum is σ = 798312. Its totient is φ = 532200.

The previous prime is 665251. The next prime is 665267. The reversal of 665255 is 552566.

665255 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 665255 - 2² = 665251 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 (665251) 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, 66521 + ... + 66530.

It is an arithmetic number, because the mean of its divisors is an integer number (199578).

2⁶⁶⁵²⁵⁵ is an apocalyptic number.

665255 is a deficient number, since it is larger than the sum of its proper divisors (133057).

665255 is a wasteful number, since it uses less digits than its factorization.

665255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133056.

The product of its digits is 9000, while the sum is 29.

The square root of 665255 is about 815.6316570610. The cubic root of 665255 is about 87.2963426794.

The spelling of 665255 in words is "six hundred sixty-five thousand, two hundred fifty-five".