165740605 has 4 divisors (see below), whose sum is σ = 198888732. Its totient is φ = 132592480.

The previous prime is 165740581. The next prime is 165740611. The reversal of 165740605 is 506047561.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60000516 + 105740089 = 7746^2 + 10283^2 .

It is not a de Polignac number, because 165740605 - 2¹⁵ = 165707837 is a prime.

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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16574056 + ... + 16574065.

It is an arithmetic number, because the mean of its divisors is an integer number (49722183).

Almost surely, 2^165740605 is an apocalyptic number.

It is an amenable number.

165740605 is a deficient number, since it is larger than the sum of its proper divisors (33148127).

165740605 is an equidigital number, since it uses as much as digits as its factorization.

165740605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33148126.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 165740605 is about 12874.0283128475. The cubic root of 165740605 is about 549.3000517493.

The spelling of 165740605 in words is "one hundred sixty-five million, seven hundred forty thousand, six hundred five".