Some fun numbers to play with.
The US national debt is something in the region of $23 trillion. Throwing around words like "trillion" make things seem trivial so let's write it out in full. The national debt is in the region of $23,000,000,000,000.
If the average rate of interest paid on this debt is 1% (and much if it will be higher than that) that means the annual bill for interest is in the region of $230bn, or $230,000,000,000.
Divide the annual interest by 12 and we see the monthly bill for interest is $19,166,666,666.
Divide the monthly interest by 30 and the daily bill for interest is more or less $638,000,000.
Divide the daily interest by 24 and the interest costs $26,600,000 every hour.
Divide this by 3600 and we can see that the interest on the national debt incurs a cost, every single second of every day, of $7,400.
Seven thousand, four hundred dollars, in interest on the debt, every single second of every single day, and the debt keeps rising. The national median wage is, I believe, somewhere in the region of $55,000. That means what the median working person makes in a year, the national debt costs in less than eight seconds.
Yup, the economy is vibrant. If you're willing to take the kind of definition of "vibrant" that would make Bill Clinton's verbal gymnastics during the Monica Lewinsky saga look positively reasonable.