681722218016 has 24 divisors (see below), whose sum is σ = 1533874991040. Its totient is φ = 292166664768.

The previous prime is 681722217971. The next prime is 681722218057. The reversal of 681722218016 is 610812227186.

681722218016 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1521701156 + ... + 1521701603.

It is an arithmetic number, because the mean of its divisors is an integer number (63911457960).

Almost surely, 2^681722218016 is an apocalyptic number.

It is an amenable number.

681722218016 is an abundant number, since it is smaller than the sum of its proper divisors (852152773024).

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

681722218016 is a wasteful number, since it uses less digits than its factorization.

681722218016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3043402776 (or 3043402768 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 44.

The spelling of 681722218016 in words is "six hundred eighty-one billion, seven hundred twenty-two million, two hundred eighteen thousand, sixteen".