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Would it theoretically be the Javascript Max Safe Integer?

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    What does Javascript have to do with it??? Since the largest unsigned integer type is uint256, the max integer value is 2 ^ 256 - 1. – goodvibration Jan 12 '18 at 21:24
  • How hard would it be to create a coin with 2 ^ 256 - 1 supply? – user28818 Jan 12 '18 at 21:37
  • That's a totally different question, so you might want to post it separately. In any case, it seems to consist of two unrelated questions - how hard would it be to create a coin (which is the main question IMO), and how to set the supply to maximum (which, if I understand correctly, is just one line of code once you complete the first part - something like uint256 supply = ~0). – goodvibration Jan 12 '18 at 21:48
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Tokens on the Ethereum blockchain are normally stored inside an ERC20 compliant smart contract. Inside this contract the balance of each account is held inside a mapping from addresses to balances, as is explained quite well in this article. The total supply (as shown here) is stored in a state variable:

uint256 public totalSupply;

The theoretically largest value that can be stored in this variable is 2**256 - 1.

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