165543 has 8 divisors (see below), whose sum is σ = 252288. Its totient is φ = 94584.

The previous prime is 165541. The next prime is 165551. The reversal of 165543 is 345561.

165543 is digitally balanced in base 2 and base 7, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165543 - 2¹ = 165541 is a prime.

165543 is strictly pandigital in base 7.

165543 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 165543.

It is not an unprimeable number, because it can be changed into a prime (165541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3921 + ... + 3962.

It is an arithmetic number, because the mean of its divisors is an integer number (31536).

2¹⁶⁵⁵⁴³ is an apocalyptic number.

165543 is a deficient number, since it is larger than the sum of its proper divisors (86745).

165543 is an equidigital number, since it uses as much as digits as its factorization.

165543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7893.

The product of its digits is 1800, while the sum is 24.

The square root of 165543 is about 406.8697580307. The cubic root of 165543 is about 54.9081663095.

It can be divided in two parts, 16 and 5543, that multiplied together give a palindrome (88688).

The spelling of 165543 in words is "one hundred sixty-five thousand, five hundred forty-three".