668425 has 6 divisors (see below), whose sum is σ = 828878. Its totient is φ = 534720.

The previous prime is 668417. The next prime is 668471. The reversal of 668425 is 524866.

It can be written as a sum of positive squares in 3 ways, for example, as 73984 + 594441 = 272^2 + 771^2 .

It is not a de Polignac number, because 668425 - 2³ = 668417 is a prime.

It is a Duffinian 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, 13344 + ... + 13393.

2⁶⁶⁸⁴²⁵ is an apocalyptic number.

It is an amenable number.

668425 is a deficient number, since it is larger than the sum of its proper divisors (160453).

668425 is a wasteful number, since it uses less digits than its factorization.

668425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26747 (or 26742 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 668425 is about 817.5726267433. The cubic root of 668425 is about 87.4347813329.

The spelling of 668425 in words is "six hundred sixty-eight thousand, four hundred twenty-five".