It's about 900 times as heavy as a Quarter
In other words, 0.00000000500 megatonnes is 881.80 times the weight of a Quarter, and the weight of a Quarter is 0.001134 times that amount.(United States quarter-dollar coin) (a.k.a. Quarter dollar, a.k.a. America the Beautiful quarter, a.k.a. two bits)
The America the Beautiful series quarters, which began to enter circulation in 2017, weigh 0.000000000005670 megatonnes each. In answer to the common riddle, there are 119 ridges around the edge of the coin in its current design.
It's about 1,000 times as heavy as a sheet of Paper
In other words, the weight of a sheet of Paper is 0.001 times 0.00000000500 megatonnes.(for US Letter, a.k.a. ANSI A; 215.9mm by 279.4mm (8.5 in x 11 in); 20lb)
The weight of a ream (500 sheets) of 0.00000000910 megatonnes, 8.5 inch x 11 inch paper is 0.00000000200 megatonnes, each sheet weighing 0.00000000000500 megatonnes. Paper of this size has a thickness of 0.004 caliper (0.1 mm).
It's about 1,000 times as heavy as a Die (Dice)
In other words, 0.00000000500 megatonnes is 1,200 times the weight of a Die (Dice), and the weight of a Die (Dice) is 0.00083 times that amount.(for six-sided, 16 mm, rounded cube)
A die, of the size most commonly used in board games and casinos, typically weight 0.00000000000410 megatonnes. The use of dice and dice-like tools predates written history, with the oldest known examples belonging to a 5,000-year old backgammon set uncovered during an archaeological dig in modern-day Iran.
It's about one-one-thousandth as heavy as an Elephant
In other words, 0.00000000500 megatonnes is 0.00083 times the weight of an Elephant, and the weight of an Elephant is 1,200 times that amount.(for African bush elephant, Loxodonta africana) (Adult, bull)
A bull African bush elephant weighs about 0.00000610 megatonnes. Among African elephants, both males and females have tusks (whereas female Asian elephants, Elephas maximus, do not have tusks) which can grow to 3 m (10 ft) and typically weigh about 0.00000400 megatonnes
It's about one-one-thousand-five-hundredth as heavy as a Tyrannosaurus rex
In other words, the weight of a Tyrannosaurus rex is 1,300 times 0.00000000500 megatonnes.(for FMNH PR2081, a.k.a. "Sue") (a.k.a. Tyrannosaurus, a.k.a. T-Rex) (estimated live weight)
The notable Tyrannosaurus specimen housed at the Field Museum of Natural History in Chicago, Illinois, "Sue," is estimated to have weighed about 0.00000640 megatonnes while alive. A renowned predator in popular culture, the teeth of tyrannosaurus rex were up to 33.02 cm (13 in) long.
It's about 2,000 times as heavy as a Penny
In other words, the weight of a Penny is 0.0005 times 0.00000000500 megatonnes.(United States) (formally one-cent coin) (Union shield design, 2010-present)
The weight of a United States penny is 0.00000000000250 megatonnes. According to a 2010 report by the United States Mint, the cost of manufacturing and distributing a penny is $0.0179 — more than its face-value.
It's about one-two-thousand-five-hundredth as heavy as an Anchor of a Cruise Ship
In other words, 0.00000000500 megatonnes is 0.000442 times the weight of an Anchor of a Cruise Ship, and the weight of an Anchor of a Cruise Ship is 2,260 times that amount.(for QE2 forward anchor, a.k.a. RMS Queen Elizabeth 2)
Each of the forward anchors of the RMS Queen Elizabeth 2 weighs 0.00001130 megatonnes. The anchor of the QE2 now sits in front of the Holyrood Church in Southampton, England, United Kingdom, along a pedestrian tourist route known as "the QE2 mile."