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The Number 645: Properties and Meanings

Prime 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.

645 is the number of + signs needed to write the Partitions of 14.


The Year 645 AD

In the year 645 AD...

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