664925 has 6 divisors (see below), whose sum is σ = 824538. Its totient is φ = 531920.

The previous prime is 664891. The next prime is 664933. The reversal of 664925 is 529466.

664925 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 143641 + 521284 = 379^2 + 722^2 .

It is not a de Polignac number, because 664925 - 2⁸ = 664669 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 664891 and 664900.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664925.

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, 13274 + ... + 13323.

It is an arithmetic number, because the mean of its divisors is an integer number (137423).

2⁶⁶⁴⁹²⁵ is an apocalyptic number.

It is an amenable number.

664925 is a deficient number, since it is larger than the sum of its proper divisors (159613).

664925 is a wasteful number, since it uses less digits than its factorization.

664925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26607 (or 26602 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

The square root of 664925 is about 815.4293347679. The cubic root of 664925 is about 87.2819058305.

The spelling of 664925 in words is "six hundred sixty-four thousand, nine hundred twenty-five".