It's about 300,000 times the number of Escalators in the State of Wyoming.
In other words, the count of Escalators in the State of Wyoming is 0.000003 times 660,000.(2013 figures)
There are only two escalators in the State of Wyoming (although there are apparently plenty of elevators). It is speculated that the lack of escalators is due to the older age of the buildings and the abundance of cheap land resulting in single-story structures. At the time the last count of escalators was made, the state had a population of just 576,000 people.
It's about 100,000 times the number of Living U.S. Presidents.
In other words, the count of Living U.S. Presidents is 0.00001 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)
As of this writing, there are five living United States Presidents — President Carter, President Clinton, President Obama, and the two Presidents Bush. At no point in U.S. history have their been more than six (6) living presidents, this circumstance having occurred three times.
It's about 75,000 times the number of Symohonies Composed by Beethoven.
In other words, 660,000 is 73,333.3333333 times the count of Symohonies Composed by Beethoven, and the count of Symohonies Composed by Beethoven is 0.0000136363636364 times that amount.(a.k.a. Ludwig van Beethoven)
It's about 45,000 times the number of Living Kings and Queens.
In other words, the count of Living Kings and Queens is 0.000023 times 660,000.(2015 figures) (distinct Monarchs)
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 0.000042 times 660,000.(a.k.a. EU) (2016 figures)
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 0.000071 times 660,000.(Carcharodon carcharias) (average; including developing rows)
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 0.000083 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.