14159...64821 (281-digits)

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

                                                                           1
4159265358 9793238462 6433832795 0288419716 9399375105 8209749445 9230781640
6286208998 6280348253 4211706798 2148086513 2823066470 9384460955 0582231725
3594081284 8111745028 4102701938 5211055596 4462294895 4930381964 4288109756
6593344612 8475648233 7867831652 7120190914 5648566923 4603486104 5432664821

The smallest googol prime formed from first n digits after decimal point in π (case n=281). [Gupta]