37564...76543 (350-digits)

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

3756421724 6513326154 7745216336 1254771526 4371265437 3246517432 6517561423
1246537756 2431156423 7354627174 5162334561 2734627513 1564271265 3473456217
7256341147 6253172645 3764251313 4265773564 2116724533 1524673241 6577624531
1354267736 2541124657 3156234774 3562115726 4314526377 5421633612 4573526741
7164253167 4523354276 1346251714 3652772165 4332547613 5246173456 7211276543

An emirp where each group of seven digits is a 7-digit emirp and different permutation of 1, 2, 3, 4, 5, 6, 7. Found by James Buddenhagen, a retired mathematician living near Xico in the state of Veracruz, Mexico.