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How heavy is 645.5 miligrams?

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It's about 0.0000000005 times as heavy as a Tree (Sierra Redwood).
In other words, 645.5 miligrams is 0.0000000005 times the weight of a Tree (Sierra Redwood), and the weight of a Tree (Sierra Redwood) is 2,000,000,000 times that amount.
(a.k.a. Giant Sequoia, a.k.a. Sierran redwood, a.k.a. Wellingtonia, a.k.a. "Big Tree", Sequoiadendron giganteum)
The weight of wood in a Giant Sequoia is 1,300,000,000,000 miligrams. General Sherman, a specimen in Sequoia National Park in Visalia, California, is the largest tree in the world by volume, with an estimated weight of about 1,900,000,000,000 miligrams.
It's about 0.00000000007 times as heavy as The Eiffel Tower.
In other words, 645.5 miligrams is 0.0000000000639 times the weight of The Eiffel Tower, and the weight of The Eiffel Tower is 15,600,000,000 times that amount.
(a.k.a. La Tour Eiffel) (Paris, France) (total weight)
It's about 0.00000000005 times as heavy as The Brooklyn Bridge.
In other words, 645.5 miligrams is 0.00000000004846 times the weight of The Brooklyn Bridge, and the weight of The Brooklyn Bridge is 20,640,000,000 times that amount.
(a.k.a. New York and Brooklyn Bridge) (Manhattan and Brooklyn, New York City, New York) (total weight)
It's about 0.00000000003 times as heavy as The Statue of Liberty.
In other words, 645.5 miligrams is 0.000000000026 times the weight of The Statue of Liberty, and the weight of The Statue of Liberty is 38,000,000,000 times that amount.
(a.k.a. "Liberty Enlightening the World," a.k.a. La Liberté Éclairant le Monde) (Liberty Island, New York City, New York) (including foundation)
It's about 0.000000000006 times as heavy as The CN Tower.
In other words, 645.5 miligrams is 0.0000000000054745 times the weight of The CN Tower, and the weight of The CN Tower is 182,670,000,000 times that amount.
(a.k.a. La Tour CN, a.k.a. Canadian National Tower, a.k.a. Canada's National Tower) (Toronto, Canada)
It's about 0.000000000003 times as heavy as The Sears Tower.
In other words, 645.5 miligrams is 0.000000000003199 times the weight of The Sears Tower, and the weight of The Sears Tower is 312,600,000,000 times that amount.
(officially "Willis Tower" as of 2009) (Chicago, Illinois)
It's about 0.000000000002 times as heavy as The Empire State Building.
In other words, 645.5 miligrams is 0.00000000000195 times the weight of The Empire State Building, and the weight of The Empire State Building is 513,000,000,000 times that amount.
(New York City, New York)
The Empire State Building weighs approximately 331,000,000,000,000.0 miligrams. About 4% of the building's weight is its 6,000 cu. m (200,000 cu. ft) of limestone façade.