666685768 has 24 divisors (see below), whose sum is σ = 1454124150. Its totient is φ = 285722304.

The previous prime is 666685759. The next prime is 666685769. The reversal of 666685768 is 867586666.

666685768 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 512479044 + 154206724 = 22638^2 + 12418^2 .

It is not an unprimeable number, because it can be changed into a prime (666685769) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 849973 + ... + 850756.

Almost surely, 2^666685768 is an apocalyptic number.

It is an amenable number.

666685768 is an abundant number, since it is smaller than the sum of its proper divisors (787438382).

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

666685768 is a wasteful number, since it uses less digits than its factorization.

666685768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1700749 (or 1700738 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 58.

The square root of 666685768 is about 25820.2588677960. The cubic root of 666685768 is about 873.5888079324.

The spelling of 666685768 in words is "six hundred sixty-six million, six hundred eighty-five thousand, seven hundred sixty-eight".