165958823 has 4 divisors (see below), whose sum is σ = 173174448. Its totient is φ = 158743200.

The previous prime is 165958817. The next prime is 165958829. The reversal of 165958823 is 328859561.

165958823 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328859561 = 8011 ⋅41051.

It is an interprime number because it is at equal distance from previous prime (165958817) and next prime (165958829).

It is a cyclic number.

It is not a de Polignac number, because 165958823 - 2¹² = 165954727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165958829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3607778 + ... + 3607823.

It is an arithmetic number, because the mean of its divisors is an integer number (43293612).

Almost surely, 2^165958823 is an apocalyptic number.

165958823 is a deficient number, since it is larger than the sum of its proper divisors (7215625).

165958823 is an equidigital number, since it uses as much as digits as its factorization.

165958823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7215624.

The product of its digits is 518400, while the sum is 47.

The square root of 165958823 is about 12882.5006501067. The cubic root of 165958823 is about 549.5410198381.

The spelling of 165958823 in words is "one hundred sixty-five million, nine hundred fifty-eight thousand, eight hundred twenty-three".