168518689 has 2 divisors, whose sum is σ = 168518690. Its totient is φ = 168518688.

The previous prime is 168518633. The next prime is 168518717. The reversal of 168518689 is 986815861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141134400 + 27384289 = 11880^2 + 5233^2 .

It is an emirp because it is prime and its reverse (986815861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 168518689 - 2⁹ = 168518177 is a prime.

It is not a weakly prime, because it can be changed into another prime (168518629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84259344 + 84259345.

It is an arithmetic number, because the mean of its divisors is an integer number (84259345).

Almost surely, 2^168518689 is an apocalyptic number.

It is an amenable number.

168518689 is a deficient number, since it is larger than the sum of its proper divisors (1).

168518689 is an equidigital number, since it uses as much as digits as its factorization.

168518689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 829440, while the sum is 52.

The square root of 168518689 is about 12981.4748391699. The cubic root of 168518689 is about 552.3521183764.

The spelling of 168518689 in words is "one hundred sixty-eight million, five hundred eighteen thousand, six hundred eighty-nine".