I was thinking about how fast the earth moves around the sun.
Google says we travel 584,000,000 miles
So 584,000,000 miles divided by 365 days is 1,6000,000 miles per day.
Then divide 1,600,000 by 24 hours and it turns out we are traveling at 66,666.66666666666666666666666666666666666 etc. mph
Trust but verify
I googled the same and you are right, OP!
I wonder who would pick a number like that, and for what purpose? With the frequency of its use, it's almost like it's a religious symbol for them! Once you find it, you know who you are dealing with and whether the information is accurate!