74074...72279 (2693-digits)

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

Just showing those entries submitted by 'Sariyar': (Click here to show all)

(6 + 66 + 666 + 6666 + ... + 666...666) + 1 is the smallest titanic prime and largest known prime of this form. [Sariyar]