A prime number is any whole number that can only be divided by itself or 1 to produce a whole number result, except 1 itself (although 1 used to be considered a prime number).
The specific prime number you gave is the Fermat prime of order 12, the largest known Fermat prime. Fermat primes are equal to 2^(2^n)+1.
It was discovered in 1996 by a computer program called Proth.exe, written by Yves Gallot.
It is now used in elliptic curve cryptography, for securing online transactions.
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