665023673 has 2 divisors, whose sum is σ = 665023674. Its totient is φ = 665023672.

The previous prime is 665023669. The next prime is 665023691. The reversal of 665023673 is 376320566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 619163689 + 45859984 = 24883^2 + 6772^2 .

It is a cyclic number.

It is not a de Polignac number, because 665023673 - 2² = 665023669 is a prime.

It is a super-3 number, since 3×665023673³ (a number of 27 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (665023643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332511836 + 332511837.

It is an arithmetic number, because the mean of its divisors is an integer number (332511837).

Almost surely, 2^665023673 is an apocalyptic number.

It is an amenable number.

665023673 is a deficient number, since it is larger than the sum of its proper divisors (1).

665023673 is an equidigital number, since it uses as much as digits as its factorization.

665023673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 38.

The square root of 665023673 is about 25788.0529121529. The cubic root of 665023673 is about 872.8622308004.

The spelling of 665023673 in words is "six hundred sixty-five million, twenty-three thousand, six hundred seventy-three".