665274917 has 2 divisors, whose sum is σ = 665274918. Its totient is φ = 665274916.

The previous prime is 665274913. The next prime is 665274941. The reversal of 665274917 is 719472566.

665274917 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., 576048001 + 89226916 = 24001^2 + 9446^2 .

It is a cyclic number.

It is not a de Polignac number, because 665274917 - 2² = 665274913 is a prime.

It is a super-3 number, since 3×665274917³ (a number of 27 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665274913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332637458 + 332637459.

It is an arithmetic number, because the mean of its divisors is an integer number (332637459).

Almost surely, 2^665274917 is an apocalyptic number.

It is an amenable number.

665274917 is a deficient number, since it is larger than the sum of its proper divisors (1).

665274917 is an equidigital number, since it uses as much as digits as its factorization.

665274917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 635040, while the sum is 47.

The square root of 665274917 is about 25792.9237776565. The cubic root of 665274917 is about 872.9721385605.

The spelling of 665274917 in words is "six hundred sixty-five million, two hundred seventy-four thousand, nine hundred seventeen".