16561
This number is a prime.
16561 = 9^2^2 + 10^2^2. [Imgregor]
The smallest palindromic prime consisting of the digits in
which biquadrates of positive digits end. It is also the
sum of biquadrates of two successive numbers, i.e.,
9^4+10^4. [Loungrides]
The smallest multidigit palindromic Quartan prime. [Gupta]
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