165138055 has 4 divisors (see below), whose sum is σ = 198165672. Its totient is φ = 132110440.

The previous prime is 165138053. The next prime is 165138059. The reversal of 165138055 is 550831561.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 165138055 - 2¹ = 165138053 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165138055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165138053) 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 3 ways as a sum of consecutive naturals, for example, 16513801 + ... + 16513810.

It is an arithmetic number, because the mean of its divisors is an integer number (49541418).

Almost surely, 2^165138055 is an apocalyptic number.

165138055 is a deficient number, since it is larger than the sum of its proper divisors (33027617).

165138055 is an equidigital number, since it uses as much as digits as its factorization.

165138055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33027616.

The product of its (nonzero) digits is 18000, while the sum is 34.

The square root of 165138055 is about 12850.6052386648. The cubic root of 165138055 is about 548.6335833004.

The spelling of 165138055 in words is "one hundred sixty-five million, one hundred thirty-eight thousand, fifty-five".