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The Number 645: Properties and MeaningsPrime Factors of 645=3x5x43.
645 is an Octagonal Number.
645 is a 66-gonal Number.
645 is a 216-gonal Number.
645 is a Centered 23-gonal Number.
645 is a Heptagonal Pyramidal Number.
The Year 645 ADIn the year 645 AD...
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