680909590818 has 64 divisors (see below), whose sum is σ = 1554396894720. Its totient is φ = 220783107456.

The previous prime is 680909590799. The next prime is 680909590843. The reversal of 680909590818 is 818095909086.

680909590818 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 31 ways as a sum of consecutive naturals, for example, 8866855 + ... + 8943317.

It is an arithmetic number, because the mean of its divisors is an integer number (24287451480).

Almost surely, 2^680909590818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 680909590818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (777198447360).

680909590818 is an abundant number, since it is smaller than the sum of its proper divisors (873487303902).

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

680909590818 is a wasteful number, since it uses less digits than its factorization.

680909590818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80968 (or 80962 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 63.

The spelling of 680909590818 in words is "six hundred eighty billion, nine hundred nine million, five hundred ninety thousand, eight hundred eighteen".