168857538161 has 32 divisors (see below), whose sum is σ = 185098411008. Its totient is φ = 153111813120.

The previous prime is 168857538151. The next prime is 168857538167. The reversal of 168857538161 is 161835758861.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168857538161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 168857538161.

It is not an unprimeable number, because it can be changed into a prime (168857538167) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105733415 + ... + 105735011.

It is an arithmetic number, because the mean of its divisors is an integer number (5784325344).

Almost surely, 2^168857538161 is an apocalyptic number.

It is an amenable number.

168857538161 is a deficient number, since it is larger than the sum of its proper divisors (16240872847).

168857538161 is a wasteful number, since it uses less digits than its factorization.

168857538161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2321.

The product of its digits is 9676800, while the sum is 59.

The spelling of 168857538161 in words is "one hundred sixty-eight billion, eight hundred fifty-seven million, five hundred thirty-eight thousand, one hundred sixty-one".