How to factorize 13916767508299776?

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Hi, I want to factorize 13916767508299776 into its prime factors. How can ew do that?
Thanks in advance.

Accepted Answer

Walter Roberson
Walter Roberson on 13 Jun 2020
factor(uint64(13916767508299776))

More Answers (1)

madhan ravi
madhan ravi on 13 Jun 2020
factor(sym(13916767508299776))
  2 Comments
Walter Roberson
Walter Roberson on 13 Jun 2020
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 on 13 Jun 2020
Thank you sir Walter, very useful.

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