64006...02401 (128-digits)

This number is a prime.

             64006241 6084592957 7656255476 5329518450 4149004761 4624448943
5642254096 3969384437 2136003481 3364324931 3630252916 2809270426 0125002401

The smallest googol prime formed from reverse concatenation of n consecutive 4-digit square numbers (n=32). [Gupta]