2^256 = 115,792,089,237,316,195,423,570,985,008,687,907,853,269,984,665,640,564,039,457,584,007,913,129,639,935

function typeMax() public view returns (uint256 max, uint256 min) {
    max = type(uint256).max;
    min = type(uint256).min;
    console.log("max is",max);
    console.log("min is",min);
  }

console.log:

max is 115792089237316195423570985008687907853269984665640564039457584007913129639935 min is 0