Gigantopithecus was the biggest primate about six to nine million years ago. It had enormous strength, which kept it safe from the predators of that time.
Gigantopithecus's huge size became fatal in climate change and reason for its extinction from Earth.
Gigantopithecus stood about 3 meters (10 ft). It weighed about 660 pounds.
Therefore our answer will be 10 ft and 660 pounds.