665250659 has 2 divisors, whose sum is σ = 665250660. Its totient is φ = 665250658.

The previous prime is 665250637. The next prime is 665250661. The reversal of 665250659 is 956052566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665250659 - 2²⁸ = 396815203 is a prime.

Together with 665250661, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (665255659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332625329 + 332625330.

It is an arithmetic number, because the mean of its divisors is an integer number (332625330).

Almost surely, 2^665250659 is an apocalyptic number.

665250659 is a deficient number, since it is larger than the sum of its proper divisors (1).

665250659 is an equidigital number, since it uses as much as digits as its factorization.

665250659 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486000, while the sum is 44.

The square root of 665250659 is about 25792.4535281155. The cubic root of 665250659 is about 872.9615280019.

The spelling of 665250659 in words is "six hundred sixty-five million, two hundred fifty thousand, six hundred fifty-nine".