This number is a prime.
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647 must be a common number to use as a big number in cartoons! In the SpongeBob SquarePants episode "Mermaid Man vs. SpongeBob", SpongeBob says that he has not seen Mermaid Man do the Spine Blaster since Episode 647. In the Scooby-Doo episode "Night of the Living Burger", Velma says that this is the 647th time that Freddie was wrong about Red Herring. 647 is a prime number. [Jacobs]