666800 has 30 divisors (see below), whose sum is σ = 1602948. Its totient is φ = 266560.

The previous prime is 666773. The next prime is 666811. The reversal of 666800 is 8666.

It is a self number, because there is not a number n which added to its sum of digits gives 666800.

It is an unprimeable number.

666800 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 434 + ... + 1233.

2⁶⁶⁶⁸⁰⁰ is an apocalyptic number.

It is an amenable number.

666800 is an abundant number, since it is smaller than the sum of its proper divisors (936148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666800 is a wasteful number, since it uses less digits than its factorization.

666800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685 (or 1674 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 666800 is about 816.5782265037. The cubic root of 666800 is about 87.3638699552.

The spelling of 666800 in words is "six hundred sixty-six thousand, eight hundred".