6.65 centimeters is equivalent to 2.618 inches.
This is slightly less than the height of a standard credit card (3.370 inches) and slightly more than the diameter of a golf ball (1.680 inches). It is also comparable to the length of a AAA battery (2.698 inches) and the width of a smartphone (2.76 inches). However, it is much smaller than the height of a standard water bottle (8 inches) or a regular sheet of printer paper (11 inches), and significantly larger than the average thickness of a pencil (0.25 inches).