648.46 centimeters is equivalent to 255.51 inches.
To put this into perspective, the average height of an adult male in the United States is around 5 feet 9 inches, or 69 inches. This means that 648.46 centimeters is approximately 3.7 times taller than an average adult male.
In terms of objects, 648.46 centimeters is roughly the same length as a standard grand piano, which is around 258.5 centimeters long. It is also slightly longer than a twin size bed, which measures around 190.5 centimeters in length. On the other hand, it is much shorter than a standard basketball hoop, which stands at 305 centimeters tall.