How to factorize 13916767508299776?

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CHANDRABHAN Singh
CHANDRABHAN Singh 2020-6-13
评论： madhan ravi 2020-6-13
Hi, I want to factorize 13916767508299776 into its prime factors. How can ew do that?
Thanks in advance.

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采纳的回答

Walter Roberson
Walter Roberson 2020-6-13
factor(uint64(13916767508299776))

更多回答（1 个）

madhan ravi
madhan ravi 2020-6-13
factor(sym(13916767508299776))
  2 个评论
Walter Roberson
Walter Roberson 2020-6-13
You should use
factor(sym('13916767508299776'))
because the argument to sym() is processed as a double before it is passed to sym, so when the value is greater than flintmax (2^53) then sym() will not necessarily receive the correct number to factor.
uint64() with a simple number as parameter is parsed as 64 bit by MATLAB; the number is not read in as double and then passed to uint64(). Not in new enough versions -- in sufficiently old releases, that did happen so it was necessary in some old enough releases to use other ways of constructing accurate uint64, such as
sscanf('13916767508299776', '%lu')
madhan ravi
madhan ravi 2020-6-13
Thank you sir Walter, very useful.

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