665275 has 24 divisors (see below), whose sum is σ = 937440. Its totient is φ = 464640.

The previous prime is 665267. The next prime is 665279. The reversal of 665275 is 572566.

It is not a de Polignac number, because 665275 - 2³ = 665267 is a prime.

It is a super-3 number, since 3×665275³ = 883333834553015625, which contains 333 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (665279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7431 + ... + 7519.

It is an arithmetic number, because the mean of its divisors is an integer number (39060).

2⁶⁶⁵²⁷⁵ is an apocalyptic number.

665275 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

665275 is a deficient number, since it is larger than the sum of its proper divisors (272165).

665275 is a wasteful number, since it uses less digits than its factorization.

665275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135 (or 130 counting only the distinct ones).

The product of its digits is 12600, while the sum is 31.

The square root of 665275 is about 815.6439174051. The cubic root of 665275 is about 87.2972174865.

The spelling of 665275 in words is "six hundred sixty-five thousand, two hundred seventy-five".