660911659 has 2 divisors, whose sum is σ = 660911660. Its totient is φ = 660911658.

The previous prime is 660911627. The next prime is 660911681. The reversal of 660911659 is 956119066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660911659 - 2⁵ = 660911627 is a prime.

It is not a weakly prime, because it can be changed into another prime (660911609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330455829 + 330455830.

It is an arithmetic number, because the mean of its divisors is an integer number (330455830).

Almost surely, 2^660911659 is an apocalyptic number.

660911659 is a deficient number, since it is larger than the sum of its proper divisors (1).

660911659 is an equidigital number, since it uses as much as digits as its factorization.

660911659 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 660911659 is about 25708.2021736254. The cubic root of 660911659 is about 871.0594654388.

The spelling of 660911659 in words is "six hundred sixty million, nine hundred eleven thousand, six hundred fifty-nine".