666363666 has 32 divisors (see below), whose sum is σ = 1346273280. Its totient is φ = 219872016.

The previous prime is 666363623. The next prime is 666363727.

666363666 is nontrivially palindromic in base 10.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 501495 + ... + 502821.

It is an arithmetic number, because the mean of its divisors is an integer number (42071040).

Almost surely, 2^666363666 is an apocalyptic number.

666363666 is an abundant number, since it is smaller than the sum of its proper divisors (679909614).

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

666363666 is a wasteful number, since it uses less digits than its factorization.

666363666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2118.

The product of its digits is 2519424, while the sum is 48.

The square root of 666363666 is about 25814.0207251796. The cubic root of 666363666 is about 873.4480969489.

The spelling of 666363666 in words is "six hundred sixty-six million, three hundred sixty-three thousand, six hundred sixty-six".