32164...85153 (41-digits)

This number is a prime.

                               3 2164049651 3216404965 0467930777 4912985153

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The smallest prime p formed from the reverse concatenation of four Armstrong numbers, i.e., {32164049651, 32164049650, 4679307774, 912985153}. Curiously, p is also expressible as the sum of two squares: (139702085452377173092^2 + 112460557403822015367^2). [Bajpai]