666568 has 16 divisors (see below), whose sum is σ = 1428480. Its totient is φ = 285648.

The previous prime is 666559. The next prime is 666599. The reversal of 666568 is 865666.

It is an unprimeable number.

666568 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 3 ways as a sum of consecutive naturals, for example, 5896 + ... + 6007.

It is an arithmetic number, because the mean of its divisors is an integer number (89280).

2⁶⁶⁶⁵⁶⁸ is an apocalyptic number.

It is an amenable number.

666568 is an abundant number, since it is smaller than the sum of its proper divisors (761912).

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

666568 is a wasteful number, since it uses less digits than its factorization.

666568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11916 (or 11912 counting only the distinct ones).

The product of its digits is 51840, while the sum is 37.

The square root of 666568 is about 816.4361579450. The cubic root of 666568 is about 87.3537365974.

The spelling of 666568 in words is "six hundred sixty-six thousand, five hundred sixty-eight".