165818303 has 24 divisors (see below), whose sum is σ = 199454400. Its totient is φ = 137372928.

The previous prime is 165818297. The next prime is 165818311. The reversal of 165818303 is 303818561.

It is not a de Polignac number, because 165818303 - 2¹⁰ = 165817279 is a prime.

It is a super-3 number, since 3×165818303³ (a number of 26 digits) contains 333 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165818333) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 204563 + ... + 205371.

It is an arithmetic number, because the mean of its divisors is an integer number (8310600).

Almost surely, 2^165818303 is an apocalyptic number.

165818303 is a deficient number, since it is larger than the sum of its proper divisors (33636097).

165818303 is an equidigital number, since it uses as much as digits as its factorization.

165818303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959 (or 952 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 165818303 is about 12877.0455850711. The cubic root of 165818303 is about 549.3858743069.

The spelling of 165818303 in words is "one hundred sixty-five million, eight hundred eighteen thousand, three hundred three".