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0.0000000000000006250 megatonnes is about 0.000000000000003 times as heavy as The Sears Tower
In other words, it's 0.0000000000000030970 times the weight of The Sears Tower, and the weight of The Sears Tower is 322,900,000,000,000.0000000000000000000 times that amount.
(officially "Willis Tower" as of 2009) (Chicago, Illinois)
The Willis Tower weighs approximately 0.20180 megatonnes. 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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