168217662889 has 2 divisors, whose sum is σ = 168217662890. Its totient is φ = 168217662888.

The previous prime is 168217662887. The next prime is 168217662919. The reversal of 168217662889 is 988266712861.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92837214864 + 75380448025 = 304692^2 + 274555^2 .

It is a cyclic number.

It is not a de Polignac number, because 168217662889 - 2¹ = 168217662887 is a prime.

Together with 168217662887, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 168217662889.

It is not a weakly prime, because it can be changed into another prime (168217662883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84108831444 + 84108831445.

It is an arithmetic number, because the mean of its divisors is an integer number (84108831445).

Almost surely, 2^168217662889 is an apocalyptic number.

It is an amenable number.

168217662889 is a deficient number, since it is larger than the sum of its proper divisors (1).

168217662889 is an equidigital number, since it uses as much as digits as its factorization.

168217662889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27869184, while the sum is 64.

The spelling of 168217662889 in words is "one hundred sixty-eight billion, two hundred seventeen million, six hundred sixty-two thousand, eight hundred eighty-nine".