In a virtual memory system, size of the virtual address is $\text{64-bit}$, size of the physical address is $\text{60-bit},$ page size is $4\;\text{Kbyte}$ and size of each page table entry is $\text{64-bits}.$ The main memory is byte addressable. The maximum number of bits that can be used for storing protection and other information in each page table entry is _______