77863899816 has 48 divisors (see below), whose sum is σ = 211209485760. Its totient is φ = 25914252960.

The previous prime is 77863899797. The next prime is 77863899823. The reversal of 77863899816 is 61899836877.

77863899816 is a `hidden beast` number, since 77 + 86 + 389 + 98 + 16 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

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 11 ways as a sum of consecutive naturals, for example, 794640 + ... + 887231.

It is an arithmetic number, because the mean of its divisors is an integer number (4400197620).

Almost surely, 2^77863899816 is an apocalyptic number.

It is an amenable number.

77863899816 is an abundant number, since it is smaller than the sum of its proper divisors (133345585944).

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

77863899816 is a wasteful number, since it uses less digits than its factorization.

77863899816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1682526 (or 1682519 counting only the distinct ones).

The product of its digits is 219469824, while the sum is 72.

The spelling of 77863899816 in words is "seventy-seven billion, eight hundred sixty-three million, eight hundred ninety-nine thousand, eight hundred sixteen".