665325 has 18 divisors (see below), whose sum is σ = 1192074. Its totient is φ = 354720.

The previous prime is 665311. The next prime is 665351. The reversal of 665325 is 523566.

665325 is a `hidden beast` number, since 6 + 653 + 2 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 4356 + 660969 = 66^2 + 813^2 .

It is not a de Polignac number, because 665325 - 2⁵ = 665293 is a prime.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 1254 + ... + 1703.

2⁶⁶⁵³²⁵ is an apocalyptic number.

It is an amenable number.

665325 is a deficient number, since it is larger than the sum of its proper divisors (526749).

665325 is a wasteful number, since it uses less digits than its factorization.

665325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2973 (or 2965 counting only the distinct ones).

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

The square root of 665325 is about 815.6745674594. The cubic root of 665325 is about 87.2994044275.

It can be divided in two parts, 665 and 325, that added together give a triangular number (990 = T₄₄).

The spelling of 665325 in words is "six hundred sixty-five thousand, three hundred twenty-five".