196665317 has 2 divisors, whose sum is σ = 196665318. Its totient is φ = 196665316.

The previous prime is 196665311. The next prime is 196665319. The reversal of 196665317 is 713566691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186431716 + 10233601 = 13654^2 + 3199^2 .

It is a cyclic number.

It is not a de Polignac number, because 196665317 - 2¹² = 196661221 is a prime.

Together with 196665319, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196665311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98332658 + 98332659.

It is an arithmetic number, because the mean of its divisors is an integer number (98332659).

Almost surely, 2^196665317 is an apocalyptic number.

It is an amenable number.

196665317 is a deficient number, since it is larger than the sum of its proper divisors (1).

196665317 is an equidigital number, since it uses as much as digits as its factorization.

196665317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 44.

The square root of 196665317 is about 14023.7411912799. The cubic root of 196665317 is about 581.5350902388.

The spelling of 196665317 in words is "one hundred ninety-six million, six hundred sixty-five thousand, three hundred seventeen".