666320707 has 4 divisors (see below), whose sum is σ = 717576160. Its totient is φ = 615065256.

The previous prime is 666320687. The next prime is 666320731. The reversal of 666320707 is 707023666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 666320707 - 2¹¹ = 666318659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666320777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25627707 + ... + 25627732.

It is an arithmetic number, because the mean of its divisors is an integer number (179394040).

Almost surely, 2^666320707 is an apocalyptic number.

666320707 is a deficient number, since it is larger than the sum of its proper divisors (51255453).

666320707 is a wasteful number, since it uses less digits than its factorization.

666320707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51255452.

The product of its (nonzero) digits is 63504, while the sum is 37.

The square root of 666320707 is about 25813.1886251970. The cubic root of 666320707 is about 873.4293267863.

The spelling of 666320707 in words is "six hundred sixty-six million, three hundred twenty thousand, seven hundred seven".