title: Preserving large numbers
body: <p>I am trying to read a CSV file that has barcodes in the first column, but when R gets it into a data.frame, it converts <code>1665535004661</code> to <code>1.67E+12</code>.</p>
  
  <p>Is there a way to preserve this number in an integer format? I tried assigning a class of <code>"double"</code>, but that didn’t work, nor did assigning a class of <code>"character"</code>. Once it is in the <code>1.67E+12</code> format any attempt to convert it back to an integer returns <code>167000000000</code>.</p>