It's about 10,000 times the number of Countries in Africa.
In other words, 660,000 is 12,000 times the count of Countries in Africa, and the count of Countries in Africa is 0.0000830 times that amount.(2016 figures) (sovereign states recognized by the UN only)
The continent of Africa includes 54 sovereign countries recognized by the United Nations as of 2016. It is the second-most populous continent in the world, with 1.1 billion inhabitants.
It's about 15,000 times the number of Teeth in a Great White Shark's Mouth.
In other words, the count of Teeth in a Great White Shark's Mouth is 0.0000710 times 660,000.(Carcharodon carcharias) (average; including developing rows)
A Great White Shark has 48 exposed teeth on their upper and lower jaws. Behind these exposed teeth are developing teeth — up to 300 in about 5 rows. The sharks will continuously lose and replace the exposed teeth throughout their lives.
It's about 25,000 times the number of Countries in the European Union.
In other words, the count of Countries in the European Union is 0.0000420 times 660,000.(a.k.a. EU) (2016 figures)
It's about one-thirty-thousandth the number of Chickens in the World.
In other words, the count of Chickens in the World is 29,000 times 660,000.(a.k.a. fowl) (Gallus gallus domesticus) (2011 figures) (average population)
It's about 45,000 times the number of Living Kings and Queens.
In other words, the count of Living Kings and Queens is 0.0000230 times 660,000.(2015 figures) (distinct Monarchs)
As of 2015, the world has fifteen Kings and Queens reigning over 45 countries. Of all these, Queen Elizabeth the II is the only reigning Queen; she has monarchical authority over the sixteen of the Commonwealth nations.
It's about 75,000 times the number of Symphonies Composed by Beethoven.
In other words, 660,000 is 73,333.33333330 times the count of Symphonies Composed by Beethoven, and the count of Symphonies Composed by Beethoven is 0.00001363636363640 times that amount.(a.k.a. Ludwig van Beethoven)
It's about 100,000 times the number of Living U.S. Presidents.
In other words, the count of Living U.S. Presidents is 0.00001000 times 660,000.(a.k.a. Presidents of the United States; a.k.a. Presidents of the United States of America; a.k.a. POTUS), (2016 figures) (including current)