It's about 550 times as heavy as a Deck of Cards
In other words, the weight of a Deck of Cards is 0.0018 times 0.0000000540 megatonnes.(ISO 216 B8 size, a.k.a. "poker size" 63 x 88 mm, 52-card deck)
A deck of 52 ISO 216 B8-size playing cards weighs 0.0000000000940 megatonnes. Utilizing nearly 3,700 decks, the record-holding largest card tower was built in early 2010, stood over 3.5 m (11 ft), and weighed over 0.000000230 megatonnes.
It's about 850 times as heavy as a Battery (C)
In other words, the weight of a Battery (C) is 0.0012 times 0.0000000540 megatonnes.(Alkaline)
A "C" size battery weighs 0.0000000000650 megatonnes. C batteries are typically used in medium-drain devices such as musical instruments.
It's about 950 times as heavy as a Tennis Ball
In other words, 0.0000000540 megatonnes is 936 times the weight of a Tennis Ball, and the weight of a Tennis Ball is 0.00107 times that amount.(ITF Standard; for Type 2 ball)
Per International Tennis Federation standard, regulation tennis balls must weigh about 0.00000000005770 megatonnes. Competition balls are also tested for bounce height, with the standards requiring that a ball dropped from 254 cm must bounce back to a height of 135 cm to 147 cm.
It's about 1,000 times as heavy as a Golf Ball
In other words, 0.0000000540 megatonnes is 1,176 times the weight of a Golf Ball, and the weight of a Golf Ball is 0.0008503 times that amount.(per R&A USGA Rules of Golf; maximum rule weight)
According to the Rules of Golf (as approved by the United States Golf Association and the Rules Committee of the Royal and Ancient Golf Club of Saint Andrews), golf balls must weigh no more than 0.000000000045930 megatonnes. Golf balls are not required to have the familiar dimpled pattern, but the design has been popular since its invention in 1905 because it reduces drag while increasing lift.
It's about one-one-thousand-five-hundredth as heavy as The Space Shuttle
In other words, the weight of The Space Shuttle is 1,300 times 0.0000000540 megatonnes.(for Endeavour, a.k.a. OV-105, a.k.a. Orbiter Vehicle-105) (empty weight, excluding main engines)
When empty, the space shuttle Endeavour weighs 0.0000710 megatonnes. The shuttle's spacious cargo bay carried the Chandra X-ray Observatory into orbit in 1999 — a payload that weighed 0.0000200 megatonnes.
It's about 1,500 times as heavy as a Light Bulb
In other words, the weight of a Light Bulb is 0.00063 times 0.0000000540 megatonnes.(a.k.a. lamp) (for A19-size, 60w, incandescent bulb by Bulbrite; package weight)
A standard, sixty-watt light bulb weighs about 0.0000000000340 megatonnes. The tightly-coiled filament inside a bulb of this size would measure about 579mm if uncoiled and stretched out.
It's about one-two-thousandth as heavy as a Blue Whale
In other words, 0.0000000540 megatonnes is 0.000517 times the weight of a Blue Whale, and the weight of a Blue Whale is 1,930 times that amount.(Balaenoptera musculus)
Blue whales weigh between 0.000105 megatonnes. The largest mammal to have ever lived, blue whales feed almost exclusively on krill — tiny invertebrates weighing about 0.000000000001000 megatonnes each.