666366 has 32 divisors (see below), whose sum is σ = 1451520. Its totient is φ = 203136.

The previous prime is 666353. The next prime is 666403. The reversal of 666366 is 663666.

It is a nude number because it is divisible by every one of its digits.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

666366 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 15 ways as a sum of consecutive naturals, for example, 4725 + ... + 4863.

It is an arithmetic number, because the mean of its divisors is an integer number (45360).

2⁶⁶⁶³⁶⁶ is an apocalyptic number.

666366 is an abundant number, since it is smaller than the sum of its proper divisors (785154).

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

666366 is a wasteful number, since it uses less digits than its factorization.

666366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208.

The product of its digits is 23328, while the sum is 33.

The square root of 666366 is about 816.3124401845. The cubic root of 666366 is about 87.3449116725.

The spelling of 666366 in words is "six hundred sixty-six thousand, three hundred sixty-six".