$500,000,000,000
Don't worry, compare to our debt $15 trillion debt=15,000,000,000,000, not much.
Please remember the following number, we are getting there someday
10^6 = a million
10^9 = billion
10^12 = trillion
10^15 = quadrillion
10^18 = quintillion
10^21 = sextillion
10^24 = septillion
10^27 = octillion
10^30 = nonillion
10^33 = decillion