99999...22211 (100-digits)

This number is a prime.

                                            9999999999 9999999999 9998888888
8888888888 8877777777 7777777776 6666666666 6655555555 5554444444 3333322211

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A one hundred-digit prime consisting of twenty-three 9's, nineteen 8's, seventeen 7's, thirteen 6's, eleven 5's, seven 4's, five 3's, three 2's, and two 1's. It has, in descending order, nth prime copies of the digit n. Note that 100 is the sum of these nine primes. [Cami]