It's about 100,000 times as heavy as a Penny.
In other words, the weight of a Penny is 0.00001000 times 551.15565550 pounds.(United States) (formally one-cent coin) (Union shield design, 2010-present)
The weight of a United States penny is 0.0055 pounds. 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 150,000 times as heavy as a Playing Card.
In other words, the weight of a Playing Card is 0.00000710 times 551.15565550 pounds.(ISO 216 B8 size, 2.5" x 3.5")
A single ISO 216 B8-size playing card weighs 0.004 pounds. Although this size is the most common home playing card, many casinos use "bridge size" cards — 2,640 sq. mm (4.036 sq. in) smaller in area.
It's about 200,000 times as heavy as a Paper Clip.
In other words, 551.15565550 pounds is 180,000 times the weight of a Paper Clip, and the weight of a Paper Clip is 0.00000560 times that amount.(average)
Notwithstanding the tremendous variation in sizes and materials, a typical paperclip weighs about 0.0031 pounds. The country of Norway has used the paper clip as something of a national symbol since the end of World War II based on the erroneous notion that the paperclip was invented by a Norwegian, Johan Vaaler. However, the paperclip had already been in existence for at least 30 years by the time of Vaaler patented his paperclip design.
It's about 250,000 times as heavy as a Jelly Bean.
In other words, the weight of a Jelly Bean is 0.00000430 times 551.15565550 pounds.(for Jelly Belly beans; approximate)
Made of sugar, corn syrup, and pectin, a single jelly bean weighs about 0.0025 pounds. President Ronald Reagan cited jelly beans as his favorite candy and 7,000 lbs of the candies were served at his first inauguration in 1981.
It's about 300,000 times as heavy as a Nail.
In other words, 551.15565550 pounds is 320,000 times the weight of a Nail, and the weight of a Nail is 0.00000310 times that amount.(for 15-gauge, 2-inch, finishing nails)
A two-inch finishing nail weighs 0.0017 pounds. Nails have been in use for more than 5,400 years and were ven used as a medium of exchange in ancient times.
It's about one-four-hundred-fifty-thousandth as heavy as The CN Tower.
In other words, 551.15565550 pounds is 0.00000212030 times the weight of The CN Tower, and the weight of The CN Tower is 471,630 times that amount.(a.k.a. La Tour CN, a.k.a. Canadian National Tower, a.k.a. Canada's National Tower) (Toronto, Canada)
The CN Tower weighs approximately 259,950,000 pounds. The Tower is home to the world's highest glass floor — a viewing area that allows visitors to look straight down 342 m (1,120 ft) to the ground below.
It's about one-eight-hundred-thousandth as heavy as The Sears Tower.
In other words, 551.15565550 pounds is 0.0000012390 times the weight of The Sears Tower, and the weight of The Sears Tower is 807,100 times that amount.(officially "Willis Tower" as of 2009) (Chicago, Illinois)
The Willis Tower weighs approximately 444,900,000 pounds. 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.