168091685793 has 6 divisors (see below), whose sum is σ = 242799101714. Its totient is φ = 112061123856.

The previous prime is 168091685771. The next prime is 168091685813. The reversal of 168091685793 is 397586190861.

It can be written as a sum of positive squares in only one way, i.e., 165928319649 + 2163366144 = 407343^2 + 46512^2 .

It is not a de Polignac number, because 168091685793 - 2¹² = 168091681697 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 168091685793.

It is not an unprimeable number, because it can be changed into a prime (168091685743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9338426980 + ... + 9338426997.

Almost surely, 2^168091685793 is an apocalyptic number.

It is an amenable number.

168091685793 is a deficient number, since it is larger than the sum of its proper divisors (74707415921).

168091685793 is a wasteful number, since it uses less digits than its factorization.

168091685793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18676853983 (or 18676853980 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 63.

The spelling of 168091685793 in words is "one hundred sixty-eight billion, ninety-one million, six hundred eighty-five thousand, seven hundred ninety-three".