664325 has 6 divisors (see below), whose sum is σ = 823794. Its totient is φ = 531440.

The previous prime is 664319. The next prime is 664331. The reversal of 664325 is 523466.

It is an interprime number because it is at equal distance from previous prime (664319) and next prime (664331).

It can be written as a sum of positive squares in 3 ways, for example, as 231361 + 432964 = 481^2 + 658^2 .

It is not a de Polignac number, because 664325 - 2¹⁰ = 663301 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 664294 and 664303.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13262 + ... + 13311.

It is an arithmetic number, because the mean of its divisors is an integer number (137299).

2⁶⁶⁴³²⁵ is an apocalyptic number.

It is an amenable number.

664325 is a deficient number, since it is larger than the sum of its proper divisors (159469).

664325 is a wasteful number, since it uses less digits than its factorization.

664325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26583 (or 26578 counting only the distinct ones).

The product of its digits is 4320, while the sum is 26.

The square root of 664325 is about 815.0613473844. The cubic root of 664325 is about 87.2556447718.

It can be divided in two parts, 664 and 325, that added together give a palindrome (989).

The spelling of 664325 in words is "six hundred sixty-four thousand, three hundred twenty-five".