666698507 has 2 divisors, whose sum is σ = 666698508. Its totient is φ = 666698506.

The previous prime is 666698497. The next prime is 666698519. The reversal of 666698507 is 705896666.

666698507 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666698507 - 2⁶ = 666698443 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (666698587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333349253 + 333349254.

It is an arithmetic number, because the mean of its divisors is an integer number (333349254).

Almost surely, 2^666698507 is an apocalyptic number.

666698507 is a deficient number, since it is larger than the sum of its proper divisors (1).

666698507 is an equidigital number, since it uses as much as digits as its factorization.

666698507 is an odious number, because the sum of its binary digits is odd.

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

The square root of 666698507 is about 25820.5055527579. The cubic root of 666698507 is about 873.5943720615.

The spelling of 666698507 in words is "six hundred sixty-six million, six hundred ninety-eight thousand, five hundred seven".