72257...61849 (172-digits)

This number is a probable-prime (likely to be a prime but we have not (re-)proven it on this site).

                                         72 2570566889 6724656164 0062416084
5929577656 2554765329 5184504149 0047614624 4489435642 2540963969 3844372136
0034813364 3249313630 2529162809 2704260125 0024012304 2209211620 2519361849

The largest prime formed from reverse concatenation of n consecutive 4-digit square numbers (n=43). [Gupta]