Programming Challenge: Find a Particular Prime Number

[Thomas Okken]

I didn't realize that "billion" still means 10^12 in (any parts of) the English-speaking world! Do those dialects also still use "milliard" etc.?

Allowing the word "and" doesn't change things, though: "eight billion and eighteen hundred eighty-one." Unless there are rules about where exactly "and" is or isn't allowed in a number, and as a non-native speaker, I have nothing to contribute to that discussion. :-)