168198689 has 2 divisors, whose sum is σ = 168198690. Its totient is φ = 168198688.

The previous prime is 168198647. The next prime is 168198727. The reversal of 168198689 is 986891861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102718225 + 65480464 = 10135^2 + 8092^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168198689 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (168191689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84099344 + 84099345.

It is an arithmetic number, because the mean of its divisors is an integer number (84099345).

Almost surely, 2^168198689 is an apocalyptic number.

It is an amenable number.

168198689 is a deficient number, since it is larger than the sum of its proper divisors (1).

168198689 is an equidigital number, since it uses as much as digits as its factorization.

168198689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1492992, while the sum is 56.

The square root of 168198689 is about 12969.1437265534. The cubic root of 168198689 is about 552.0022765169.

The spelling of 168198689 in words is "one hundred sixty-eight million, one hundred ninety-eight thousand, six hundred eighty-nine".