165255915 has 16 divisors (see below), whose sum is σ = 288446976. Its totient is φ = 80124000.

The previous prime is 165255911. The next prime is 165255917. The reversal of 165255915 is 519552561.

It is not a de Polignac number, because 165255915 - 2² = 165255911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165255911) 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, 500611 + ... + 500940.

It is an arithmetic number, because the mean of its divisors is an integer number (18027936).

Almost surely, 2^165255915 is an apocalyptic number.

165255915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

165255915 is a deficient number, since it is larger than the sum of its proper divisors (123191061).

165255915 is a wasteful number, since it uses less digits than its factorization.

165255915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001570.

The product of its digits is 67500, while the sum is 39.

The square root of 165255915 is about 12855.1901969594. The cubic root of 165255915 is about 548.7640732654.

The spelling of 165255915 in words is "one hundred sixty-five million, two hundred fifty-five thousand, nine hundred fifteen".