How can i get right result using Power function.

Question

Select power(n,n) as result from dual;

 

If  n as number :1-----------68

If n as binary_double :1-----------138 

 

it gives right result.But i want extends the nth value it gives overflow error. 

 

 

 

 *************Error*****************

The following error has occurred:

ORA-01426: numeric overflow

 

*************Error*****************