Liters can't be converted to millimeters. Liters measures volume and millimeters measures length.
This tank has a maximum capacity of 50,550 liters of water.
You are missing a measurement to obtain volume. A height it going to be needed.
About 177 liters.
4.5 liters is 274.61 cubic inches.
401 cubic inches is 6.571 liters.
80 liters is 4,881.9 cubic inches.
6 liters = 366.142465 cubic inches
6.6 liters is 402.76 cubic inches.
500 liters is 30,511.9 cubic inches.
4.3 liters = 262.4021 cubic inches