77991446555792 has 360 divisors, whose sum is σ = 194080130576640. Its totient is φ = 30249988876800.

The previous prime is 77991446555741. The next prime is 77991446555801. The reversal of 77991446555792 is 29755564419977.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 41908352942 + ... + 41908354802.

It is an arithmetic number, because the mean of its divisors is an integer number (539111473824).

Almost surely, 2^{77991446555792} 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 77991446555792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97040065288320).

77991446555792 is an abundant number, since it is smaller than the sum of its proper divisors (116088684020848).

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

77991446555792 is a wasteful number, since it uses less digits than its factorization.

77991446555792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3651 (or 3627 counting only the distinct ones).

The product of its digits is 6001128000, while the sum is 80.

The spelling of 77991446555792 in words is "seventy-seven trillion, nine hundred ninety-one billion, four hundred forty-six million, five hundred fifty-five thousand, seven hundred ninety-two".