Petaflop

1,000 trillion (mathematical) operations per second

I just read about a newly developed chinese supercomputer that has this capacity.

Is zillion a real number? I kind of thought 1,000T was a Z.
Anyway,
there are (or will be) other supercomputers with even more capacity for awesomeness.

Kind of Godlike, no?
What is the capacity of the human brain, I wonder...
answer?

(is there a difference between an 'operation' and a 'calculation'?)