I hear reference to the number of debt ceiling increases as the main factor when comparing presidents.
I usually hear that Reagan raised the debt 18 timed. A little research at the Office of Management and Budget web site reveals this is true. The debt ceiling spreadsheet data is from 1940 to the present.
I did infer the following from Table 7.3, Statutory Limits on Federal Debt 1940-Current.
President Reagan
approved of increasing the debt ceiling 18 times
for a total increase of $684.4 Billion, $684,400,000, $684.4 thousand million.
President George H.W. Bush
approved of increasing the debt ceiling 9 times
for a total increase of $1,345 Billion, $1,345, 000,000, $1.345 Trillion.
President Clinton
approved of increasing the debt ceiling 6 times
for a total increase of $1,805 Billion, $1,805,000,000, $1.805 Trillion.
President G.W. Bush
approved of increasing the debt ceiling 7 times
for a total increase of $5,365 Billion, $5,365 Million, $5.365 Trillion.
President Obama
approved of increasing the debt ceiling 11 times
for a total increase of 5,896.6 Billion $5,896.6 Million, $5.896.6 Trillion.