666752706 has 12 divisors (see below), whose sum is σ = 1444630902. Its totient is φ = 222250896.

The previous prime is 666752689. The next prime is 666752707. The reversal of 666752706 is 607257666.

It can be written as a sum of positive squares in only one way, i.e., 591219225 + 75533481 = 24315^2 + 8691^2 .

It is not an unprimeable number, because it can be changed into a prime (666752707) 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, 18520891 + ... + 18520926.

Almost surely, 2^666752706 is an apocalyptic number.

666752706 is an abundant number, since it is smaller than the sum of its proper divisors (777878196).

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

666752706 is a wasteful number, since it uses less digits than its factorization.

666752706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37041825 (or 37041822 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 45.

The square root of 666752706 is about 25821.5550654874. Note that the first 3 decimals coincide. The cubic root of 666752706 is about 873.6180442601.

The spelling of 666752706 in words is "six hundred sixty-six million, seven hundred fifty-two thousand, seven hundred six".