The verse in Scripture that talks about the "number of the beast" is:
It is in Greek, not Hebrew and the number is six hundred and sixty.
The Greek lexicon has this for the number:
χξς, six hundred and sixty-six (chi Χ = 600; xi Ξ = 60; sigma ς' = 6), a mystical number the meaning of which is clear when it is written in Hebrew letters, קסר נרון, i. e. Νέρων Καῖσαρ, 'Nero Caesar' (sometimes the Jews write קסר for the more common קיסר, the Syriac always rSK [], cf. Ewald, Die Johann. Schriften, ii., p. 263 note; (Schürer, N. T. Zeitgesch. edition 1, § 25 III., p. 449 note); נ (nun) = 50, ר (resh) = 200, ו (waw) = 6, נ (nun) = 50, ק (qoph = 100, ס (camek) = 60, ר (resh) = 200): Revelation 13:18 R G T Tr. (For a digest of opinions respecting this much debated number see Lee in the 'Speaker's commentary' at the passage.)
In medieval manuscripts of the Book of Revelation, the number of the Beast 666 is written as χξϛ (600 + 60 + 6). (Numbers larger than 1,000 reused the same letters but included various marks to note the change.)
How to count in Hebrew (עברית), a Semitic language spoken mainly in Israel. Hebrew letters are used to a limited extent to represent numbers, mainly on calendars. For other uses Western (Arabic) numerals (1, 2, 3, etc) are used.
Hebrew for 600 is: (shesh meot) שֵׁשׁ מֵאוֹת ת״ר
60 is: (shishim) שִׁשִּׁים ס
And 6 is: (shishit) שִׁשִּׁית (shishi) שִׁשִּׁי (shesh) שֵׁשׁ (shisha) שִׁשָּׁה ו
Mostly good but you might want to check your math here:
“Six hundred threescore and six. (Revelation 13:16-18)
It is in Greek, not Hebrew and the number is six hundred and sixty.”
Nope. Six hundred plus three score (60) plus six is 666, not “Six hundred and sixty” aka 660.