684577218816 has 72 divisors (see below), whose sum is σ = 2024415291360. Its totient is φ = 228192403968.

The previous prime is 684577218749. The next prime is 684577218823. The reversal of 684577218816 is 618812775486.

It is a happy number.

684577218816 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49514010 + ... + 49527833.

Almost surely, 2^684577218816 is an apocalyptic number.

It is an amenable number.

684577218816 is an abundant number, since it is smaller than the sum of its proper divisors (1339838072544).

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

684577218816 is an equidigital number, since it uses as much as digits as its factorization.

684577218816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99041868 (or 99041848 counting only the distinct ones).

The product of its digits is 36126720, while the sum is 63.

The spelling of 684577218816 in words is "six hundred eighty-four billion, five hundred seventy-seven million, two hundred eighteen thousand, eight hundred sixteen".