665631325 has 6 divisors (see below), whose sum is σ = 825382874. Its totient is φ = 532505040.

The previous prime is 665631251. The next prime is 665631377. The reversal of 665631325 is 523136566.

It can be written as a sum of positive squares in 3 ways, for example, as 95472441 + 570158884 = 9771^2 + 23878^2 .

It is not a de Polignac number, because 665631325 - 2⁹ = 665630813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13312602 + ... + 13312651.

Almost surely, 2^665631325 is an apocalyptic number.

It is an amenable number.

665631325 is a deficient number, since it is larger than the sum of its proper divisors (159751549).

665631325 is a wasteful number, since it uses less digits than its factorization.

665631325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26625263 (or 26625258 counting only the distinct ones).

The product of its digits is 97200, while the sum is 37.

The square root of 665631325 is about 25799.8318792972. The cubic root of 665631325 is about 873.1280033021.

The spelling of 665631325 in words is "six hundred sixty-five million, six hundred thirty-one thousand, three hundred twenty-five".