Is there any way to find arithmetic mean “better” than sum()/N?

Question

Suppose we have N numbers(integers, floats, whatever you want) and want to find their arithmetic mean. Simplest method is to sum all values and divide by number of values:

Answer 1

If the big integers are problem... is it ok

a/N + b/N+.... n/N

I mean you're looking just for other ways or the optimal way?