665253 has 20 divisors (see below), whose sum is σ = 1022208. Its totient is φ = 430920.

The previous prime is 665251. The next prime is 665267. The reversal of 665253 is 352566.

665253 is a `hidden beast` number, since 6 + 652 + 5 + 3 = 666.

It is not a de Polignac number, because 665253 - 2¹ = 665251 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

665253 is a lucky 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 19 ways as a sum of consecutive naturals, for example, 3388 + ... + 3578.

2⁶⁶⁵²⁵³ is an apocalyptic number.

It is an amenable number.

665253 is a deficient number, since it is larger than the sum of its proper divisors (356955).

665253 is a wasteful number, since it uses less digits than its factorization.

665253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246 (or 237 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 665253 is about 815.6304310164. The cubic root of 665253 is about 87.2962551977.

The spelling of 665253 in words is "six hundred sixty-five thousand, two hundred fifty-three".