Query execution with mod results zero

Hi,

When below query is executing, mod more than 40 digits returning 0 and mod of 39 digits returning the correct value. 

Can any one help me out on this?

Wrong output: 

SQL> SELECT mod(power(10,44),100) FROM dual;

MOD(POWER(10,44),100)

---------------------

                    0

Correct :

SQL> SELECT mod(power(10,39),97) FROM dual;

MOD(POWER(10,39),97)

--------------------

                  77

Regards,

Sriram