U.S. government debt stands at $210 trillion, not the official $13.1 trillion, according to a new working paper published by the Mercatus Center at George Mason University. That’s equivalent to $654,205 per person in the United States, 16 times higher than the current official level.

The paper was authored by Laurence Kotlikoff, an economics professor at Boston University, and Adam Michel with the Mercatus Center. Rather than examine how much debt the government has now, they included how much debt the government will take on in the future.