10449...71773 (84-digits)

This number is a prime.

                                                             1044 9567633177
8315966103 8789034507 0198960878 1073244439 9506194317 4891239690 4023371773

A prime number equal to 9^87-6^(5-4)+3^2+1, an arithmetic expression using all digits from 1 to 9 in descending order. [Rivera]