It's about 3,500 times as long as a Strand of Spaghetti (thickness).
In other words, the length of a Strand of Spaghetti (thickness) is 0.0003 times 556.90 centimeters.(average; restaurant and supermarket applications) (based on FMA Omcan Italian Made TR50 Counter Top Pasta Machine Extruder 13317)
An average strand of restaurant-grade spaghetti measures 0.170 centimeters in thickness. In 2010, a California Buca di Beppo set a world record by preparing a 13,780-lb bowl of spaghetti, served in a swimming pool.
It's about 4,500 times as long as a Grain of Sand.
In other words, 556.90 centimeters is 4,460 times the length of a Grain of Sand, and the length of a Grain of Sand is 0.000224 times that amount.(medium grain)
Composed mainly of quartz, mica, feldspar, or magnetite, a grain of sand measures an average of 0.1250 centimeters. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 1,510 centimeters in height.
It's about one-five-thousandth as tall as Olympus Mons.
In other words, 556.90 centimeters is 0.00021 times the height of Olympus Mons, and the height of Olympus Mons is 4,800 times that amount.(a.k.a. Mount Olympus) (Mars)
The tallest mountain in the solar system, Olympus Mons rises to approximately 2,700,000 centimeters. The mountain has been known to astronomers since the nineteenth century because it is tall enough to rise above Mars' frequent dust storms.
It's about one-fifteen-thousandth as long as The Panama Canal.
In other words, the length of The Panama Canal is 16,000 times 556.90 centimeters.(Canal de Panamá) (Panama)
Connecting the Atlantic and Pacific Oceans across the Isthmus of Panama, the Canal measures 8,800,000 centimeters in length. Ships passing through the Canal are raised (and then lowered) 2,600 centimeters above sea level through the lock-and-dam system.
It's about one-twenty-thousandth as long as The English Channel.
In other words, the length of The English Channel is 19,200 times 556.90 centimeters.(average width between Isle of Ushant and The Walde Lighthouse) (La Manche, Ärmelkanal, Mor Breizh, Mor Bretannek) (a.k.a. The Channel)
The English Channel measures between 10,700,000 centimeters, narrowing as it flows northeast. The world speed record for a Channel crossing by swimmer was set by Australian Trent Grimsey in 2012, with a time of 6 hours, 55 minutes.
It's about one-twenty-thousandth as long as The 405.
In other words, 556.90 centimeters is 0.0000477860 times the length of The 405, and the length of The 405 is 20,927 times that amount.(a.k.a. I-405, Interstate 405, San DIego Freeway) (Southern California)
Running from Irvine to San Fernando, The 405 runs a total of 11,654,000 centimeters. The 405 is the most heavily-trafficed freeway in the United States, with an average speed as low as 8 kph during rush hours.
It's about one-twenty-thousandth as long as Hadrian's Wall.
In other words, the length of Hadrian's Wall is 22,000 times 556.90 centimeters.(a.k.a. Roman Wall, a.k.a. The Wall, a.k.a. Vallo di Adriano, a.k.a. Vallum Aelium, a.k.a. Severus' Wall) (from North Tyneside, Tyne and Wear, England, United Kingdom to Cumbria, North West England, United Kingdom)
Hadrian's Wall, which crossed England form the North Sea to the Irish Sea during the time of Roman rule, measures 12,000,000 centimeters (about 79 Roman miles). Roman soldiers — at one time up to 10,000 of them — only occupied Great Britain for about 246 years after the wall was built, after which time the local Brits began to take residence the wall's garrisons.