how to off scientific notation in value of a variable??

as in my variable ff=1.011110000111111e+63 i want its 64 digit number in normal format. i have used num2str(ff,'%.0f') but it gives different values from the previous ones

[Titus Edelhofer]

Hmm, to me the output of num2str(ff, '%.0f') looks good ...?

[Jan]

Different from which previous one? You want a number with 64 digits, although double variables have a precision of about 16 digits only?