Answer:
Giga, 1x10⁹.
Step-by-step explanation:
Hello,
In this case, if we chew over Google's name, we can see that it suggests the word Giga which in conversion units context accounts for the Giga prefix (G) which has a value of 1x10⁹.
For instance 1 meter in gigameters is:

Which suggests that it is a huge unit and it makes sense considering the raft of information Google handles.
Regards.