1 billion times 1 billion calculations per second. *LINK*
Intel said on Monday that it would build the US's most powerful supercomputer, so fast that it could process 1 quintillion — 1 billion times 1 billion, or 1,000,000,000,000,000,000 — calculations per second.
To put that in perspective: If every person on Earth did one calculation (say, a math problem involving algebra) per second, it would take everyone over four years to do all the calculations Aurora could do in one second.