Using the primality test on this site, I found that the concatenation of the digit reversal of the first 548 odd primes in the reverse order is a prime!. It is only a 1998-digit prime, but it took more than an hour for the site's calculator to state that it is a prime.
The calculation went super slowly. Could someone here confirm that this result is correct?.
The result I got is 7693749334931393 ... 91713111753.