Six identical numbers must be multiples of11,1 1 1 = 37 * 3, so the product must be multiples of 3 and 37. So the grade must be a multiple of 3,7, 1 1,13,37. The multiplicand is multi-digit and the multiplier is single-digit, so the multiplier (number) can only be 3 or 7.
If the number =3, then 30000~40000, *3 can only be the first six digits of 1. Once this happens, the unit of multiplicand-interest will be unqualified.
So the number can only be 7.
At this time, because the product can only be all 5. Otherwise 7*7=49. There are different numbers.
So the product should be 555555. The original five digits can only be 555555/7=79365.