This browser is out of date and will not support some of this site's functionality. For better site performance, please update your browser to the newest version:

we know there is 365 days in one year,so it is 365 times 13 billion,which is 4 trillion 745 billion days, now for the hours, there is 24 hours in one day,so it is 24 times 4 trillion 745 billion ,so you do first 24 times 745 billion then add the answer to the 24 times 4 trillion...