Six-hundred-sixty-six or six-six-six or six-one-six

Regarding the passage of Revelation 13:18, which is likely the most proper way to present the Beast's number? - 600+60+6 (six hundred and sixty six) - 6-6-6 (six six six) - 600+10+6 (six hundred and sixteen) - 6-1-6 (six one six)