Equatorial Guinea

#162 of 193 countries

3782867425484632

That piece first turns up at decimal place 3,812,935,792 of π (about 3.8 billion digits in).

Equatorial Guinea is 16 digits on the keypad. We look up at most 10 digits at a time, so it is ranked by its longest piece we found: the 10 digits 3782867425.