r - multiplication of very large with small values -

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as result of large binomial coefficient summed sorry stored number big integer (from gmp) package

big integer ('bigz') : [1] > choosez(1599,999)

big integer ('bigz') : [1] 64702725976477841685087011694882593433664461459998756503370133423490886710992479387020713114439119078572270410565905096678530812549132718109065352925330156276352159906752920126061592461003982967533637590930195693832792290806000097619179060714793020167850667221328682056807933391950779186595385360309444776548462757363488307499961774581415255778468273486215727708155489945082243963752226921889401251140938597561863975549109487674702867681182063412410767713200

now need multiply 

[1] 1.884357e-08

if convert big integer number 1.88 e-8 rounded 0 means multiplication 0. how can multiply both numbers in r

can't divide big number 1x10^8 (as integer) , multiply 18884357?


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