formatting - How to format a large Number

There is a large number

a = 123456789012345678901234567.123456789012345678901234567

By format with AccountingForm

b = AccountingForm[a, 54]

it becomes

123456789012345678901234567.123456789012345678901234567

How to to parameterise the integer part and the fractional and the
n-digit precision part to produce a number. Like

int=123456789012345678901234567.  

fra=.123456789012345678901234567  
pre=54

resulting to the same outcome like b above?

UPDATE

A general solution was found.

int = 1234567890123456789012345678900;
fra = 123456789012345678901234567890;

SetPrecision[ToExpression[ToString[int] <> "." <> ToString[fra]], 

StringLength[ToString[int]] + StringLength[ToString[fra]]]

is still a number,

1.234567890123456789012345678900123456789012345678901234567890*10^30

now look at it as a string with all digits minutely preserved

ScientificForm[%, ExponentStep -> StringLength[ToString[int]]]  

1234567890123456789012345678900.123456789012345678901234567890

Comments

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