168511116789 has 6 divisors (see below), whose sum is σ = 243404946486. Its totient is φ = 112340744520.

The previous prime is 168511116779. The next prime is 168511116791. The reversal of 168511116789 is 987611115861.

168511116789 is a `hidden beast` number, since 1 + 6 + 8 + 511 + 116 + 7 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 95471730225 + 73039386564 = 308985^2 + 270258^2 .

It is not a de Polignac number, because 168511116789 - 2²⁰ = 168510068213 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168511116779) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9361728702 + ... + 9361728719.

It is an arithmetic number, because the mean of its divisors is an integer number (40567491081).

Almost surely, 2^168511116789 is an apocalyptic number.

It is an amenable number.

168511116789 is a deficient number, since it is larger than the sum of its proper divisors (74893829697).

168511116789 is a wasteful number, since it uses less digits than its factorization.

168511116789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18723457427 (or 18723457424 counting only the distinct ones).

The product of its digits is 725760, while the sum is 54.

The spelling of 168511116789 in words is "one hundred sixty-eight billion, five hundred eleven million, one hundred sixteen thousand, seven hundred eighty-nine".