386 Jean-Marie De Koninck
179 084 769 654 285 362 176 (= 10610)
the fifth number n 1 whose sum of digits is equal to
10

n (see the number
13 744 803 133 596 058 624).
186 264 514 898 681 640 625 (=
514
· 30 517 578 121)
a 4-hyperperfect number, possibly the third one (see the number 1 950 625).
201 467 286 689 315 906 290
the number of prime numbers
1022.
295 147 905 179 352 825 856 (=
268)
the smallest power of 2 which uses all the digits from 0 to 9.
328 256 967 373 616 371 221 (=
321
· 31381059607)
a 2-hyperperfect number, possibly the sixth one (see the number 21).
449 177 399 146 038 697 307
the second narcissistic prime with more than one digit (see the number
28 116 440 335 967).
480 682 838 924 478 847 449 (=
11710)
the largest number n whose sum of digits is equal to
10

n (see the number
13 744 803 133 596 058 624).
632 127 050 601 113 666 430
possibly the second number n such that P
(n)4|n
and P (n +
1)4|n
+ 1: here
632 127 050 601 113 666 430 = 2 ·
34
· 5 · 13 · 41 · 71 ·
21314,
632 127 050 601 113 666 431 = 7 · 193 · 2521 ·
36914;
(see the number 11 859 210).
999 999 999 999 999 999 899
the largest 21 digit prime number.
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