How to factorize 13916767508299776?

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

Thanks in advance.

Answer 1

[Walter Roberson]

factor(uint64(13916767508299776))

Answer 2

[madhan ravi]

factor(sym(13916767508299776))

[Walter Roberson]

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]

Thank you sir Walter, very useful.