Infinitely many.
Start with 1+665, 1+1+664, 1+1+1+663, ...
Then 1+2+663, 1+3+662, etc
and so on
Then you can start including negative numbers, and then fractions (rationals) and then irrationals. And, if you are up to it, you can even include complex numbers.
And that is only additions and subtractions.
So next you can look at multiplications and divisions and go through the same kind of routine.
And then you can try powers (exponents) and logarithms.
And then you can start combining these operations.
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Three times... 666 pieces of gold for the king, 666 men of the tribes and 666 mentioned in revelations as the number of man and beast.
DCLXVI= 666 666 is the number of the beast these were the digists of roman emperor Nero
Eight: 111 116 161 166 611 616 661 666.
lcm of 666 and 1000 is 333,000
The fear of the number 666 is called Hexakosioihexekontahexaphobia - and thus its sufferers are Hexakosioihexekontahexaphobics.