The Number of the Beast is Inside....

666 = number of the Beast
665 = older brother of the Beast
660 = approximate number of the Beast
66600 = zip code of the Beast
$665.95 = retail price of the Beast
DCLXVI = Roman numeral of the Beast
666.0000 = Number of the High-Precision Beast
0.666 = Number of the Millibeast
/666 = Beast Common Denominator
-666½ = Imaginary number of the Beast
6.66e3 = Floating point Beast
1010011010 = Binary number of the Beast
6, uh . . . what was that number again? = Number of the Blonde Beast
1-666 = Area code of the Beast
666 mph = Speed limit of the Beast
$699.30 = Price of the Beast plus 5% state sales tax
$769.95 = Price of the Beast with all accessories and replacement soul
$656.66 = Walmart price of the Beast
$646.66 = Next week's Walmart price of the Beast
Phillips 666 = Gasoline of the Beast
Route 666 = Way of the Beast
666 F = Oven temperature for roast Beast
352 – Oven temperature for roast Beast in Europe
666(k) = Retirement plan of the Beast
666 mg = Recommended Minimum Daily Requirement of Beast
6.66% = 5-yr CD interest rate at 1st Beast of Hell Nat. Bank, $666 min. deposit
$666/hr = Beast's lawyer's billing rate
Lotus 6-6-6 = Spreadsheet of the Beast
Word 6.66 = Word Processor of the Beast
i66686 = CPU of the Beast
665.9997856 = Number of the Beast on a Pentium
666i = BMW of the Beast
DSM-666 (revised) = Diagnostic and Statistical Manual of the Beast
1232 Octal, Apt. 29A = Beast's hexed address
668 = Next-door neighbor of the Beast
333 = The semi-Christ

Added cause I think they're good too:
667 = Neighbor of the Beast
669 = Happy Neighbor of the Beast