Is 165389899 a prime number?
It is possible to find out using mathematical methods whether a given integer is a prime number or not.
Yes, 165 389 899 is a prime number.
Indeed, the definition of a prime numbers is to have exactly two distinct positive divisors, 1 and itself. A number is a divisor of another number when the remainder of Euclid’s division of the second one by the first one is zero. Concerning the number 165 389 899, the only two divisors are 1 and 165 389 899. Therefore 165 389 899 is a prime number.
As a consequence, 165 389 899 is only a multiple of 1 and 165 389 899.
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Since 165389899 is a prime number, 165389899 is also a deficient number, that is to say 165389899 is a natural integer that is strictly larger than the sum of its proper divisors, i.e., the divisors of 165389899 without 165389899 itself (that is 1, by definition!).