665616359 has 2 divisors, whose sum is σ = 665616360. Its totient is φ = 665616358.

The previous prime is 665616349. The next prime is 665616461. The reversal of 665616359 is 953616566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665616359 - 2⁸ = 665616103 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665616349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332808179 + 332808180.

It is an arithmetic number, because the mean of its divisors is an integer number (332808180).

Almost surely, 2^665616359 is an apocalyptic number.

665616359 is a deficient number, since it is larger than the sum of its proper divisors (1).

665616359 is an equidigital number, since it uses as much as digits as its factorization.

665616359 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 874800, while the sum is 47.

The square root of 665616359 is about 25799.5418370172. The cubic root of 665616359 is about 873.1214594737.

The spelling of 665616359 in words is "six hundred sixty-five million, six hundred sixteen thousand, three hundred fifty-nine".