99989...04051 (74-digits)

This number is a prime.

                                                                        9998
9897979696 9685858584 8484847373 7373737373 6262626262 6251514040 5151404051

The largest possible self-descriptive prime with repetitions allowed. Found by Ash Manning on 18 October 2025. (See Puzzle 324). [Rivera]