:1. Five hundred and twenty eight billion nine hundred and sixteen million three hundred and seventy four thousand eight hundred and twenty five.
2. Nine hundred and eighteen billion two hundred and seventy three million six hundred and forty five thousand seven hundred and thirty eight.
3, 4, 5 по системе: "число" hundred and "число + ty" "число" "billion, million или thousand". Если от 13 до 19 в "число + ty" "число", то "число после 1 + teen".