165215545 has 32 divisors (see below), whose sum is σ = 233873280. Its totient is φ = 110730240.

The previous prime is 165215543. The next prime is 165215549. The reversal of 165215545 is 545512561.

It is not a de Polignac number, because 165215545 - 2¹ = 165215543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165215545.

It is not an unprimeable number, because it can be changed into a prime (165215543) 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 31 ways as a sum of consecutive naturals, for example, 36529 + ... + 40801.

It is an arithmetic number, because the mean of its divisors is an integer number (7308540).

Almost surely, 2^165215545 is an apocalyptic number.

It is an amenable number.

165215545 is a deficient number, since it is larger than the sum of its proper divisors (68657735).

165215545 is a wasteful number, since it uses less digits than its factorization.

165215545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4345.

The product of its digits is 30000, while the sum is 34.

The square root of 165215545 is about 12853.6199181398. The cubic root of 165215545 is about 548.7193841744.

The spelling of 165215545 in words is "one hundred sixty-five million, two hundred fifteen thousand, five hundred forty-five".