165260605 has 4 divisors (see below), whose sum is σ = 198312732. Its totient is φ = 132208480.

The previous prime is 165260581. The next prime is 165260633. The reversal of 165260605 is 506062561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 506062561 = 509 ⋅994229.

It can be written as a sum of positive squares in 2 ways, for example, as 90973444 + 74287161 = 9538^2 + 8619^2 .

It is not a de Polignac number, because 165260605 - 2⁵ = 165260573 is a prime.

It is a super-2 number, since 2×165260605² = 54622135129932050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent 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, 16526056 + ... + 16526065.

It is an arithmetic number, because the mean of its divisors is an integer number (49578183).

Almost surely, 2^165260605 is an apocalyptic number.

It is an amenable number.

165260605 is a deficient number, since it is larger than the sum of its proper divisors (33052127).

165260605 is an equidigital number, since it uses as much as digits as its factorization.

165260605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33052126.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 165260605 is about 12855.3726122583. The cubic root of 165260605 is about 548.7692645655.

The spelling of 165260605 in words is "one hundred sixty-five million, two hundred sixty thousand, six hundred five".