665923361 has 2 divisors, whose sum is σ = 665923362. Its totient is φ = 665923360.

The previous prime is 665923339. The next prime is 665923399. The reversal of 665923361 is 163329566.

665923361 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 can be written as a sum of positive squares in only one way, i.e., 461433361 + 204490000 = 21481^2 + 14300^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665923361 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (665923861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332961680 + 332961681.

It is an arithmetic number, because the mean of its divisors is an integer number (332961681).

Almost surely, 2^665923361 is an apocalyptic number.

It is an amenable number.

665923361 is a deficient number, since it is larger than the sum of its proper divisors (1).

665923361 is an equidigital number, since it uses as much as digits as its factorization.

665923361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 41.

The square root of 665923361 is about 25805.4909079444. The cubic root of 665923361 is about 873.2556753426.

The spelling of 665923361 in words is "six hundred sixty-five million, nine hundred twenty-three thousand, three hundred sixty-one".