Earth speed around the sun - 66,600 mph 

Earth tilt from horizontal - 66.6 degrees    (23.4 from vertical)

Earth curvature - .666' x miles x miles   (8" per mile squared to miles)

Earth circumference in nautical miles - 600x6x6

Arctic and Antarctic circles - 66.6 degrees

Diameter of the moon - 6x6x60 miles 

666 Connections to the antichrist -> 

"And the number of his name is 666" 

Barack Hussein Obama - 18 letters= 6+6+6 = 18

Monster drink logo (the "Beast" of revelation) - vav vav vav (Hebrew letter 6) =666

Born on the 216th day of the year - 216= 6x6x6

Elected from Zip code 60606

The winning lottery # in his home state the day after his first election - 666