668925 has 24 divisors (see below), whose sum is σ = 1230080. Its totient is φ = 356400.

The previous prime is 668903. The next prime is 668929. The reversal of 668925 is 529866.

It is not a de Polignac number, because 668925 - 2¹³ = 660733 is a prime.

It is a Curzon number.

668925 is a lucky number.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 668925.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668929) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 180 + ... + 1170.

2⁶⁶⁸⁹²⁵ is an apocalyptic number.

It is an amenable number.

668925 is a deficient number, since it is larger than the sum of its proper divisors (561155).

668925 is a wasteful number, since it uses less digits than its factorization.

668925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010 (or 999 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 668925 is about 817.8783528129. The cubic root of 668925 is about 87.4565770939.

The spelling of 668925 in words is "six hundred sixty-eight thousand, nine hundred twenty-five".