68161720872 has 96 divisors (see below), whose sum is σ = 205060874400. Its totient is φ = 18803223936.

The previous prime is 68161720831. The next prime is 68161720933. The reversal of 68161720872 is 27802716186.

68161720872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 965218 + ... + 1033425.

It is an arithmetic number, because the mean of its divisors is an integer number (2136050775).

Almost surely, 2^68161720872 is an apocalyptic number.

It is an amenable number.

68161720872 is an abundant number, since it is smaller than the sum of its proper divisors (136899153528).

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

68161720872 is a wasteful number, since it uses less digits than its factorization.

68161720872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1998695 (or 1998684 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 48.

The spelling of 68161720872 in words is "sixty-eight billion, one hundred sixty-one million, seven hundred twenty thousand, eight hundred seventy-two".