663925 has 6 divisors (see below), whose sum is σ = 823298. Its totient is φ = 531120.

The previous prime is 663907. The next prime is 663937. The reversal of 663925 is 529366.

It can be written as a sum of positive squares in 3 ways, for example, as 33489 + 630436 = 183^2 + 794^2 .

It is not a de Polignac number, because 663925 - 2⁵ = 663893 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, 13254 + ... + 13303.

2⁶⁶³⁹²⁵ is an apocalyptic number.

It is an amenable number.

663925 is a deficient number, since it is larger than the sum of its proper divisors (159373).

663925 is a wasteful number, since it uses less digits than its factorization.

663925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26567 (or 26562 counting only the distinct ones).

The product of its digits is 9720, while the sum is 31.

The square root of 663925 is about 814.8159301339. The cubic root of 663925 is about 87.2381286136.

The spelling of 663925 in words is "six hundred sixty-three thousand, nine hundred twenty-five".