10223...64511 (1800-digits)
This number is a prime.
10223454 * 10^1792 + 72064511 and its twin 10223454 * 10^1792 + 72064513 are both emirps: the largest known twin
emirps (as of 3 November 2026). All four primes were proven by ECPP. [Garg]
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