Extension Method to count number of properties

I have about 1000 classes in which i need to count the number of properties of. I have the following code:

        public static int NumberOfProperties()
    {
        Type type = typeof(C507);
        return type.GetProperties().Count();
    }

I could copy and paste this in to each class changing the typeof parameter but this seems a bit tedious, is there anyway to make an extensions method to do this by just doing var nop = C507.NumberOfProperties();