What is the sum of the digits of the product of 6666666*234234?
6666666*234234乘积的各位数字之和为多少．
<gadget id="calculator">1 + 5 + 6 + 1 + 5 + 5 + 9 + 8 + 4 + 3 + 8 + 4 + 4</gadget>
<output>63</output>

<result>63</result>