Any mathanon know when, why, where & who of going from base 12 to base 5?

I'm asking because if you divide 5 by 33 you get 151515 and I think that could be counstrued as 666. I came up this watching a video on a new community in the UK with 33 residents, costing $5m.

I was wondering what they broke down to per resident. 151,515