Write out all the numbers?

every now and then, gotta think a bit what exact money i got.

for example, what is 1,657.64M SC$? is it 1,657,640,000 SC$? or 1,657,640 SC$, or what exactly is this amount?

that "M" there causes confusion to me.

if too lazy to write all numbers out, why not just written as "1.66T SC$" ??

M stands for Million. 1,657.64M means actually you have 1.657.64 Billion dollars i think forgive if i am wrong math is NOT my best thing

Yes, and T (trillion) = 1000 B (billion)

And, if you have an account like mine:

Q (quadtrillion) = 1000 T (trillion)