168518717 has 2 divisors, whose sum is σ = 168518718. Its totient is φ = 168518716.

The previous prime is 168518689. The next prime is 168518719. The reversal of 168518717 is 717815861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105966436 + 62552281 = 10294^2 + 7909^2 .

It is a cyclic number.

It is not a de Polignac number, because 168518717 - 2¹⁰ = 168517693 is a prime.

Together with 168518719, 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 (168518719) 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, 84259358 + 84259359.

It is an arithmetic number, because the mean of its divisors is an integer number (84259359).

Almost surely, 2^168518717 is an apocalyptic number.

It is an amenable number.

168518717 is a deficient number, since it is larger than the sum of its proper divisors (1).

168518717 is an equidigital number, since it uses as much as digits as its factorization.

168518717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94080, while the sum is 44.

The square root of 168518717 is about 12981.4759176297. The cubic root of 168518717 is about 552.3521489682.

It can be divided in two parts, 1685 and 18717, that added together give a palindrome (20402).

The spelling of 168518717 in words is "one hundred sixty-eight million, five hundred eighteen thousand, seven hundred seventeen".