165897005 has 4 divisors (see below), whose sum is σ = 199076412. Its totient is φ = 132717600.

The previous prime is 165896971. The next prime is 165897013. The reversal of 165897005 is 500798561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 500798561 = 19 ⋅26357819.

It can be written as a sum of positive squares in 2 ways, for example, as 100060009 + 65836996 = 10003^2 + 8114^2 .

It is not a de Polignac number, because 165897005 - 2¹⁰ = 165895981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16589696 + ... + 16589705.

It is an arithmetic number, because the mean of its divisors is an integer number (49769103).

Almost surely, 2^165897005 is an apocalyptic number.

It is an amenable number.

165897005 is a deficient number, since it is larger than the sum of its proper divisors (33179407).

165897005 is an equidigital number, since it uses as much as digits as its factorization.

165897005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33179406.

The product of its (nonzero) digits is 75600, while the sum is 41.

The square root of 165897005 is about 12880.1011253794. The cubic root of 165897005 is about 549.4727785217.

The spelling of 165897005 in words is "one hundred sixty-five million, eight hundred ninety-seven thousand, five".