Is it fifteen or Fifthteen?

How do you spell 15th?
15th = fifteenth (It's her fifteenth birthday.) Using a hyphen also applies to ordinal numbers from 21st. twenty-first = 21st (It's her 21st on Sunday.)
How do you write 17 in words?
17 in words is Seventeen.
Why is fifteen not Fiveteen?
Why's fifteen called "fifteen" instead of "fiveteen"? The hard v doesn't blend well with the following t, so it is softened to an f when v is followed by t.


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