The book is now available! 1581713009
(another Prime Pages' Curiosity)
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Participate:
+ 1581713009 = prime(1!!+5!!+8!!+1!!+7!!+1!!+3!!+0!!+0!!+9!!) * prime(prime(1!!+5!!+8!!+1!!+7!!+1!!+3!!+0!!+0!!+9!!)). It is the only number with this property. [Firoozbakht]

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