168357871818 has 128 divisors (see below), whose sum is σ = 397733068800. Its totient is φ = 52639118784.

The previous prime is 168357871817. The next prime is 168357871901. The reversal of 168357871818 is 818178753861.

It is a super-2 number, since 2×168357871818² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (168357871817) 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 63 ways as a sum of consecutive naturals, for example, 84304396 + ... + 84306392.

It is an arithmetic number, because the mean of its divisors is an integer number (3107289600).

Almost surely, 2^168357871818 is an apocalyptic number.

168357871818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 168357871818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198866534400).

168357871818 is an abundant number, since it is smaller than the sum of its proper divisors (229375196982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

168357871818 is a wasteful number, since it uses less digits than its factorization.

168357871818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2801 (or 2795 counting only the distinct ones).

The product of its digits is 18063360, while the sum is 63.

The spelling of 168357871818 in words is "one hundred sixty-eight billion, three hundred fifty-seven million, eight hundred seventy-one thousand, eight hundred eighteen".