666589760 has 56 divisors (see below), whose sum is σ = 1596624696. Its totient is φ = 265072640.

The previous prime is 666589757. The next prime is 666589783. The reversal of 666589760 is 67985666.

666589760 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 4 ways, for example, as 231283264 + 435306496 = 15208^2 + 20864^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49340 + ... + 61380.

Almost surely, 2^666589760 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666589760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (798312348).

666589760 is an abundant number, since it is smaller than the sum of its proper divisors (930034936).

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

666589760 is a wasteful number, since it uses less digits than its factorization.

666589760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12231 (or 12221 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 53.

The square root of 666589760 is about 25818.3996405664. The cubic root of 666589760 is about 873.5468713637.

The spelling of 666589760 in words is "six hundred sixty-six million, five hundred eighty-nine thousand, seven hundred sixty".