PHP, 1414 13 bytes
{"e""":<?=M_E?>} Prints a nicenice mathsy object that one could almost pretend is usefulthat one could almost pretend is useful:
{"e""":2.718281828459} Uses the fact that php prints anything outside the tags verbatim to save on some quotation marks, M_E was the shortest long enough constant I could find.
edit: saved one byte thanks to Lynn. Sadly it's no longer a 'nice' mathsy object.