168121076864 has 128 divisors (see below), whose sum is σ = 372860167680. Its totient is φ = 74983956480.

The previous prime is 168121076857. The next prime is 168121076873. The reversal of 168121076864 is 468670121861.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44205587 + ... + 44209389.

It is an arithmetic number, because the mean of its divisors is an integer number (2912970060).

Almost surely, 2^168121076864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 168121076864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186430083840).

168121076864 is an abundant number, since it is smaller than the sum of its proper divisors (204739090816).

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

168121076864 is a wasteful number, since it uses less digits than its factorization.

168121076864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4718 (or 4706 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 50.

The spelling of 168121076864 in words is "one hundred sixty-eight billion, one hundred twenty-one million, seventy-six thousand, eight hundred sixty-four".