47277...97527 (87-digits)

This number is a prime.

                                                          4727721 4610743530
2536223071 9730482246 3291469530 2097116459 8521711305 2071125636 3590397527

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The largest prime factor for the RSA challenge number RSA-576. Discovered by J. Franke, et al., on December 3, 2003. [Sladcik]