78399155568 has 80 divisors (see below), whose sum is σ = 207319052160. Its totient is φ = 25515716352.

The previous prime is 78399155557. The next prime is 78399155677. The reversal of 78399155568 is 86555199387.

It is a super-2 number, since 2×78399155568² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78399155499 and 78399155508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7299130 + ... + 7309862.

It is an arithmetic number, because the mean of its divisors is an integer number (2591488152).

Almost surely, 2^78399155568 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 78399155568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103659526080).

78399155568 is an abundant number, since it is smaller than the sum of its proper divisors (128919896592).

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

78399155568 is a wasteful number, since it uses less digits than its factorization.

78399155568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14326 (or 14320 counting only the distinct ones).

The product of its digits is 81648000, while the sum is 66.

The spelling of 78399155568 in words is "seventy-eight billion, three hundred ninety-nine million, one hundred fifty-five thousand, five hundred sixty-eight".