500 bricks to a cube I know for sure 20 yrs. ago. Don't know if it is different now. Don't know the weight but you could carry 1 cube in a half ton truck but it is a load. I used to lay brick but hope to never again.
Brick companies have been changing a little bit. It depends on the style brick and the company who makes it. Generally 500 , but I purchased 6 pallents a few months back for a job anmd the sent 300 per pallet. Just check when you order.
It all depends on the size of the brick. The last ones that I bought were a standard size and came 550 to the pallet. The brick company can tell you how many are in a cube and the weight based on the brick size.