78322816515564 has 144 divisors (see below), whose sum is σ = 212008798310400. Its totient is φ = 25257037576320.

The previous prime is 78322816515407. The next prime is 78322816515577. The reversal of 78322816515564 is 46551561822387.

78322816515564 is a `hidden beast` number, since 7 + 8 + 3 + 2 + 2 + 8 + 1 + 65 + 1 + 5 + 564 = 666.

It is a super-2 number, since 2×78322816515564² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 90659112 + ... + 91518960.

It is an arithmetic number, because the mean of its divisors is an integer number (1472283321600).

Almost surely, 2^{78322816515564} 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 78322816515564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106004399155200).

78322816515564 is an abundant number, since it is smaller than the sum of its proper divisors (133685981794836).

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

78322816515564 is a wasteful number, since it uses less digits than its factorization.

78322816515564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862922 (or 862908 counting only the distinct ones).

The product of its digits is 96768000, while the sum is 63.

The spelling of 78322816515564 in words is "seventy-eight trillion, three hundred twenty-two billion, eight hundred sixteen million, five hundred fifteen thousand, five hundred sixty-four".