168869968891 has 4 divisors (see below), whose sum is σ = 181859966512. Its totient is φ = 155879971272.

The previous prime is 168869968871. The next prime is 168869968913. The reversal of 168869968891 is 198869968861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 168869968891 - 2¹⁹ = 168869444603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168869968871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6494998791 + ... + 6494998816.

It is an arithmetic number, because the mean of its divisors is an integer number (45464991628).

Almost surely, 2^168869968891 is an apocalyptic number.

168869968891 is a deficient number, since it is larger than the sum of its proper divisors (12989997621).

168869968891 is a wasteful number, since it uses less digits than its factorization.

168869968891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12989997620.

The product of its digits is 644972544, while the sum is 79.

The spelling of 168869968891 in words is "one hundred sixty-eight billion, eight hundred sixty-nine million, nine hundred sixty-eight thousand, eight hundred ninety-one".