665323207 has 2 divisors, whose sum is σ = 665323208. Its totient is φ = 665323206.

The previous prime is 665323189. The next prime is 665323223. The reversal of 665323207 is 702323566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665323207 - 2⁷ = 665323079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665324207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332661603 + 332661604.

It is an arithmetic number, because the mean of its divisors is an integer number (332661604).

Almost surely, 2^665323207 is an apocalyptic number.

665323207 is a deficient number, since it is larger than the sum of its proper divisors (1).

665323207 is an equidigital number, since it uses as much as digits as its factorization.

665323207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 34.

The square root of 665323207 is about 25793.8598701319. The cubic root of 665323207 is about 872.9932600566.

The spelling of 665323207 in words is "six hundred sixty-five million, three hundred twenty-three thousand, two hundred seven".