@Robozoid You were very close: since 1 gram of fat is 9 calories, I calculated he has 1,000,000,000,000kg (2,204,622,800,000lbs) of fat. Human fat tissue contains about 10% water. If I add that additional water weight (1.1*2,204,622,800,000), the weight would be at approximately 2,425,085,080,000lbs. Which is approximately 94% of what you said. (Other tissue will make very little difference in weight)
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Iipa oot kova.