168855919189 has 2 divisors, whose sum is σ = 168855919190. Its totient is φ = 168855919188.

The previous prime is 168855919181. The next prime is 168855919201. The reversal of 168855919189 is 981919558861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130736480625 + 38119438564 = 361575^2 + 195242^2 .

It is a cyclic number.

It is not a de Polignac number, because 168855919189 - 2³ = 168855919181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168855919181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84427959594 + 84427959595.

It is an arithmetic number, because the mean of its divisors is an integer number (84427959595).

Almost surely, 2^168855919189 is an apocalyptic number.

It is an amenable number.

168855919189 is a deficient number, since it is larger than the sum of its proper divisors (1).

168855919189 is an equidigital number, since it uses as much as digits as its factorization.

168855919189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55987200, while the sum is 70.

The spelling of 168855919189 in words is "one hundred sixty-eight billion, eight hundred fifty-five million, nine hundred nineteen thousand, one hundred eighty-nine".