165538389 has 8 divisors (see below), whose sum is σ = 220993920. Its totient is φ = 110220896.

The previous prime is 165538381. The next prime is 165538403. The reversal of 165538389 is 983835561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165538389 - 2³ = 165538381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165538381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31677 + ... + 36530.

It is an arithmetic number, because the mean of its divisors is an integer number (27624240).

Almost surely, 2^165538389 is an apocalyptic number.

It is an amenable number.

165538389 is a deficient number, since it is larger than the sum of its proper divisors (55455531).

165538389 is an equidigital number, since it uses as much as digits as its factorization.

165538389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69019.

The product of its digits is 777600, while the sum is 48.

The square root of 165538389 is about 12866.1722746122. The cubic root of 165538389 is about 549.0765650462.

It can be divided in two parts, 16553 and 8389, that added together give a palindrome (24942).

The spelling of 165538389 in words is "one hundred sixty-five million, five hundred thirty-eight thousand, three hundred eighty-nine".