165538149 has 16 divisors (see below), whose sum is σ = 252561408. Its totient is φ = 94475952.

The previous prime is 165538123. The next prime is 165538157. The reversal of 165538149 is 941835561.

It is not a de Polignac number, because 165538149 - 2⁵ = 165538117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165538149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165538159) 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 15 ways as a sum of consecutive naturals, for example, 14184 + ... + 23070.

It is an arithmetic number, because the mean of its divisors is an integer number (15785088).

Almost surely, 2^165538149 is an apocalyptic number.

It is an amenable number.

165538149 is a deficient number, since it is larger than the sum of its proper divisors (87023259).

165538149 is an equidigital number, since it uses as much as digits as its factorization.

165538149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9784.

The product of its digits is 129600, while the sum is 42.

The square root of 165538149 is about 12866.1629478256. The cubic root of 165538149 is about 549.0762996930.

The spelling of 165538149 in words is "one hundred sixty-five million, five hundred thirty-eight thousand, one hundred forty-nine".