666210659 has 2 divisors, whose sum is σ = 666210660. Its totient is φ = 666210658.

The previous prime is 666210619. The next prime is 666210697. The reversal of 666210659 is 956012666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666210659 - 2²⁴ = 649433443 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (666210619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333105329 + 333105330.

It is an arithmetic number, because the mean of its divisors is an integer number (333105330).

Almost surely, 2^666210659 is an apocalyptic number.

666210659 is a deficient number, since it is larger than the sum of its proper divisors (1).

666210659 is an equidigital number, since it uses as much as digits as its factorization.

666210659 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 666210659 is about 25811.0569136562. The cubic root of 666210659 is about 873.3812396106.

The spelling of 666210659 in words is "six hundred sixty-six million, two hundred ten thousand, six hundred fifty-nine".