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0.00000000000000005850 megatonnes is about 0.0000000000000003 times as heavy as The Sears Tower
In other words, it's 0.00000000000000028990 times the weight of The Sears Tower, and the weight of The Sears Tower is 3,449,000,000,000,000.00000000000000000000 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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