165344681 has 4 divisors (see below), whose sum is σ = 165973632. Its totient is φ = 164715732.

The previous prime is 165344653. The next prime is 165344687. The reversal of 165344681 is 186443561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 165344681 - 2⁶ = 165344617 is a prime.

It is a super-2 number, since 2×165344681² = 54677727069983522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165344687) 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 3 ways as a sum of consecutive naturals, for example, 314081 + ... + 314606.

It is an arithmetic number, because the mean of its divisors is an integer number (41493408).

Almost surely, 2^165344681 is an apocalyptic number.

It is an amenable number.

165344681 is a deficient number, since it is larger than the sum of its proper divisors (628951).

165344681 is an equidigital number, since it uses as much as digits as its factorization.

165344681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628950.

The product of its digits is 69120, while the sum is 38.

The square root of 165344681 is about 12858.6422689178. The cubic root of 165344681 is about 548.8623105410.

The spelling of 165344681 in words is "one hundred sixty-five million, three hundred forty-four thousand, six hundred eighty-one".