165395905 has 4 divisors (see below), whose sum is σ = 198475092. Its totient is φ = 132316720.

The previous prime is 165395899. The next prime is 165395911. The reversal of 165395905 is 509593561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 509593561 = 59 ⋅8637179.

It is an interprime number because it is at equal distance from previous prime (165395899) and next prime (165395911).

It can be written as a sum of positive squares in 2 ways, for example, as 78216336 + 87179569 = 8844^2 + 9337^2 .

It is not a de Polignac number, because 165395905 - 2³ = 165395897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 16539586 + ... + 16539595.

It is an arithmetic number, because the mean of its divisors is an integer number (49618773).

Almost surely, 2^165395905 is an apocalyptic number.

It is an amenable number.

165395905 is a deficient number, since it is larger than the sum of its proper divisors (33079187).

165395905 is an equidigital number, since it uses as much as digits as its factorization.

165395905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33079186.

The product of its (nonzero) digits is 182250, while the sum is 43.

The square root of 165395905 is about 12860.6339268327. The cubic root of 165395905 is about 548.9189841112.

The spelling of 165395905 in words is "one hundred sixty-five million, three hundred ninety-five thousand, nine hundred five".