Which number seems implausible to you?  The current world's population?  The number of bitcoins that will exist?  2.1E10 divided by 7E9?  Cause they're pretty much facts, aren't they, unless I made an arithmetic error?

Sometimes I think the color of the sky seems implausible, especially at sunset, nevertheless it is what it is.  It hardly seems worth arguing that established facts seem implausible.