639.07 centimeters is approximately 251.97 inches.
To provide comparisons, here are a few items that are similar in size to 251.97 inches:
1. A standard door frame is typically 80 inches (6.67 feet) high, making 251.97 inches just over 3 times the height of a door frame.
2. The average human adult is around 62 inches (5.17 feet) tall, so 251.97 inches is more than 4 times the height of a person.
3. A king size bed is typically 80 inches (6.67 feet) long, making it about 3.15 times the length of 251.97 inches.
4. A standard upright piano is approximately 48 inches (4 feet) tall, making it about 5.25 times smaller than 251.97 inches.
5. A regulation-size basketball hoop is 120 inches (10 feet) off the ground, so 251.97 inches is just over 2 times the height of a basketball hoop.