What number is 999999999999999?

Nine hundred and ninety-nine trillion, nine hundred and ninety-nine billion, nine hundred and ninety-nine million, nine hundred and ninety-nine thousand, nine hundred and ninety-nine. (U.S. and scientific)

Nine hundred and ninety-nine billion, nine hundred and ninety-nine thousand nine hundred and ninety-nine million, nine hundred and ninety-nine thousand, nine hundred and ninety-nine. (British. Other countries use the same Wording except milliard is used for the thousands of millions).