660425 has 6 divisors (see below), whose sum is σ = 818958. Its totient is φ = 528320.

The previous prime is 660409. The next prime is 660449. The reversal of 660425 is 524066.

It can be written as a sum of positive squares in 3 ways, for example, as 2704 + 657721 = 52^2 + 811^2 .

It is not a de Polignac number, because 660425 - 2⁴ = 660409 is a prime.

It is a super-2 number, since 2×660425² = 872322361250, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 660425.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660425.

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, 13184 + ... + 13233.

It is an arithmetic number, because the mean of its divisors is an integer number (136493).

2⁶⁶⁰⁴²⁵ is an apocalyptic number.

It is an amenable number.

660425 is a deficient number, since it is larger than the sum of its proper divisors (158533).

660425 is a wasteful number, since it uses less digits than its factorization.

660425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26427 (or 26422 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 660425 is about 812.6653677868. The cubic root of 660425 is about 87.0845612844.

The spelling of 660425 in words is "six hundred sixty thousand, four hundred twenty-five".