RJC2042

Hi. I was curious about a house number. My brother is planning on buying a new home. One of the houses that he is interested has the house number 2506. I was wondering if this is a good number or a bad one. It is a two story townhouse that is approx 12 years old. Some of my friends and relatives have mentioned that it is a bad one because when added to a single digit it equals 4, but we don't know for sure if this is true and why. Please help if you can. Thanks!