I'm no expert - but isn't this showing 83MB of RAM usage? Shouldn't this be about 15MB?
83 megabytes in VIRT column is a size of virtual memory for this process. It has nothing to do with actual memory usage. See RES column (which stands for resident) - it's 5.3 megabytes, which is pretty good for Apache process.
High number in VIRT column is usually caused by some extension that's capable to share memory space among Apache instances. One example is eAccelerator, another is mod_ssl with openssl compiled with mm library, or php's curl compiled with openssl support.