Strong's #5516: chloros (pronounced khlo-ros')

the 22nd, 14th and an obsolete letter (4742 as a cross) of the Greek alphabet (intermediate between the 5th and 6th), used as numbers; denoting respectively 600, 60 and 6; 666 as a numeral:--six hundred threescore and six.

Thayer's Greek Lexicon:

chi xi sigma

1) six hundred and sixty six, the meaning of which is the basis of much vain speculation

Part of Speech: number representation

Usage:

This word is used 1 times:

 

Revelation 13:18: "and his number is Six hundred threescore and six."