165216055 has 4 divisors (see below), whose sum is σ = 198259272. Its totient is φ = 132172840.

The previous prime is 165216053. The next prime is 165216059. The reversal of 165216055 is 550612561.

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

It is not a de Polignac number, because 165216055 - 2¹ = 165216053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165216053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16521601 + ... + 16521610.

It is an arithmetic number, because the mean of its divisors is an integer number (49564818).

Almost surely, 2^165216055 is an apocalyptic number.

165216055 is a deficient number, since it is larger than the sum of its proper divisors (33043217).

165216055 is an equidigital number, since it uses as much as digits as its factorization.

165216055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33043216.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 165216055 is about 12853.6397568938. The cubic root of 165216055 is about 548.7199487835.

The spelling of 165216055 in words is "one hundred sixty-five million, two hundred sixteen thousand, fifty-five".