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1,770,000,000 pounds is about four times as heavy as The Sears Tower.
In other words, it's 3.9780 times the weight of The Sears Tower, and the weight of The Sears Tower is 0.25140 times that amount.
(officially "Willis Tower" as of 2009) (Chicago, Illinois)
The Willis Tower weighs approximately 444,900,000 pounds. The outer wall surface of the Tower is covered with black anodized aluminum panels which would total 110,000 sq. m (28 acres) if laid out together.
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