36085...36719 (25-digits)

This number is a composite.

                                                 36085 2885036840 0786036719

The average of 3608528850368400786036719 and the next prime (3608528850368400786036731) is 3608528850368400786036725, which is the largest integer such that its k leftmost digits are divided by k, for k=1 to 25. [Rivera]