Well, it seems this 3 numbers follow me and my cousin.

First my driver's licence have it,my student number both high and college,I bought a car a yr ago and did not pay attention to the plate when they put it in the car and when I got home there was the number.I have never had an accident before so meaninful just scrachts 3 or 4 but with this car I have had 6! accidents very big ones!

After 20 yrs I found my cousin (thru mothers) (we used to live in different countries) and now we are very close ,and so I found out the number follow her too!

Is in her plaque (she's police) in her car plate,even she pays for her car 666.66 and when we found each other again and she saw my car's plate she said:" oh! no it couldn't be!"

So I guess this number mean something for us or maybe is just pure coincidence

666
Potential to be too focused on materialism. A sign to quiet your mind in order to obtain balance.

666. This number which seems to attract problems has been removed from numerological plates in London following numerous complaints from the victims of car accidents. The American President, Ronald Reagan changed the number of his new house in Los Angeles from 666 to 668. However, the strangest story is perhaps that of the number 666 United States motorway between Colorado and New Mexico, where there have been hundreds of strange accidents, so that there is now a procedure going on to modify the name (number).

fear has a major potential to create such problems.

I agree with Raveness reply.  

Sometimes fear, causes problems or issues to arise.

We may do it to ourselves.  

Assuming one believes in the law of attraction.

We draw unto us, our utmost desires, and our deepest fears.