18661...19981 (1576-digits)

This number is a prime.

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The largest known strobogrammatic emirp (as of 28 October 2026). This 1576-digit prime reads the same rotated 180 degrees, and its reversal (the same digits with every 6 and 9 swapped) is also prime. Both were proven prime with ECPP (CM 0.4.4). [Garg]

Submitted: 2026-10-28 09:48:57; Last Modified: 2026-10-28 14:12:31.