78722118816 has 96 divisors (see below), whose sum is σ = 225524694528. Its totient is φ = 23845328640.

The previous prime is 78722118779. The next prime is 78722118877. The reversal of 78722118816 is 61881122787.

It is a tau number, because it is divible by the number of its divisors (96).

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, 2781151 + ... + 2809313.

It is an arithmetic number, because the mean of its divisors is an integer number (2349215568).

Almost surely, 2^78722118816 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 78722118816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112762347264).

78722118816 is an abundant number, since it is smaller than the sum of its proper divisors (146802575712).

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

78722118816 is a wasteful number, since it uses less digits than its factorization.

78722118816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30834 (or 30826 counting only the distinct ones).

The product of its digits is 602112, while the sum is 51.

The spelling of 78722118816 in words is "seventy-eight billion, seven hundred twenty-two million, one hundred eighteen thousand, eight hundred sixteen".