If you mean “aṣṭādaśa”, it means eighteen.

If you mean “aśatropahatam” / “ashatropahatam”, it generally means “unharmed by enemies” or “free from enemy-caused harm.”

So the combined sense would be something like:

“eighteen, unharmed by enemies” or, in a devotional Jain context, “protected from eighteen kinds of hostile harm.”

If you share the exact line from the stotra or sutra, I can give the precise arth in Jain meaning.