665337917 has 2 divisors, whose sum is σ = 665337918. Its totient is φ = 665337916.

The previous prime is 665337899. The next prime is 665337929. The reversal of 665337917 is 719733566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 583995556 + 81342361 = 24166^2 + 9019^2 .

It is a cyclic number.

It is not a de Polignac number, because 665337917 - 2¹⁶ = 665272381 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 (665337017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332668958 + 332668959.

It is an arithmetic number, because the mean of its divisors is an integer number (332668959).

Almost surely, 2^665337917 is an apocalyptic number.

It is an amenable number.

665337917 is a deficient number, since it is larger than the sum of its proper divisors (1).

665337917 is an equidigital number, since it uses as much as digits as its factorization.

665337917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 714420, while the sum is 47.

The square root of 665337917 is about 25794.1450139368. The cubic root of 665337917 is about 872.9996938400. Note that the first 3 decimals are identical.

The spelling of 665337917 in words is "six hundred sixty-five million, three hundred thirty-seven thousand, nine hundred seventeen".