how much data represents 1 satoshi? and on entire bitcoin
Bitcoin amount is simply a number in the outputs of transactions, bitcoins themselves don't really exist. For example, in this transaction, there is this output:


  "addr":"1P3VQasrhmCnViL4sVouxSZiSu1BRWuCvN",
           "value":6103964


Value is the number of satoshis in the output, these output values are the only representation of bitcoins on the blockchain.