10000...87937 (200-digits)

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

           1000000000 0000000000 0000000000 0000000000 0000000000 0000000000
0000000000 0000000000 0000000000 0000000000 0000000000 0000000000 0000000000
0000000000 0000000000 0000000000 0000000000 0000000000 0000045205 9153787937

Call this number p and you get the smallest 200-digit prime sextuplet, where p,p+4,p+6,p+10,p+12,p+16 are primes. [Luhn]