The book is now available! 889091889880616081
(another Prime Pages' Curiosity)
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                                                         88909188 9880616081
+ An invertible composite with invertible numbers as prime factors: 11, 101, 619, 686989 and 1881881. Note that this number is also the product of 3 invertible numbers: 6809, 686989 and 190069981. [Blanchette]

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