There could be 4 or 5 significant figures.
If the original number was in the range 65775 - 65784.999... and the answer was required to 4sfs then the result would be 65780.
The applicable rule is ...Zeros must be kept to show the position of the decimal point or to indicate that zero is a significant figure. The above example shows the zero being retained to show the position of the decimal point.
If the original number was in the range 65779.5 - 65780.499999...... and an answer to 5sfs was needed then 65780 would still be the answer. In this case the zero is a significant figure.
4
Five. All nonzero digits are significant and zeros in between significant digits are significant.
It has two significant digits.
3 significant digits.
It has 3 significant digits.
4 significant digits.
Five. All nonzero digits are significant and zeros in between significant digits are always significant.
Five. All nonzero digits are significant and zeros in between significant digits are always significant.
Five. All nonzero digits are significant and zeros in between significant digits are always significant.
000203 has 3 significant digits.
Three significant digits.
There are 3 significant digits in 20.0