16641-67-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 16641-67-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,6,6,4 and 1 respectively; the second part has 2 digits, 6 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 16641-67:
(7*1)+(6*6)+(5*6)+(4*4)+(3*1)+(2*6)+(1*7)=111
111 % 10 = 1
So 16641-67-1 is a valid CAS Registry Number.