643.84 centimeters is equal to 253.38582677 inches.
This length is slightly longer than the height of an average adult male (about 5 feet 6 inches or 167.6 cm) and slightly shorter than the width of a standard door (about 32 inches or 81.3 cm). It is also about half the length of a typical adult human femur bone (about 48 cm or 18.9 inches).
In terms of objects that are commonly used for measurement, 643.84 cm is about the length of a standard meter stick (which is 100 cm or 39.37 inches) plus an additional 143.84 cm. It is also slightly shorter than the length of a standard sword (about 40 inches or 101.6 cm).