How to process integers greater than 10 digits?

#1

64-bit integers have max of 2^32 or 4294967296
Anything above will overflow. How will I find out if my 17-digit integer string is a CB number or not ?

#2

@Sriram-Rajan-10104264111174086
Use long long int. It can store integers upto 18 digits so that should solve your problem.