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1678 centimeters is equivalent to 661.417 inches.
This is slightly larger than the height of an average adult human (which is approximately 63 inches) and about the same size as the length of a standard billiard cue (which is 59 inches). It is also slightly larger than the width of a twin size bed (39 inches) but smaller than the width of a queen size bed (60 inches). Additionally, it is about the same size as the length of an acoustic guitar (41 inches) and slightly shorter than the length of a standard basketball hoop (10 feet or 120 inches).