165544 has 8 divisors (see below), whose sum is σ = 310410. Its totient is φ = 82768.

The previous prime is 165541. The next prime is 165551. The reversal of 165544 is 445561.

It can be written as a sum of positive squares in only one way, i.e., 108900 + 56644 = 330^2 + 238^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a plaindrome in base 14.

It is a zygodrome in base 14.

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

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10339 + ... + 10354.

2¹⁶⁵⁵⁴⁴ is an apocalyptic number.

It is an amenable number.

165544 is a deficient number, since it is larger than the sum of its proper divisors (144866).

165544 is a wasteful number, since it uses less digits than its factorization.

165544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20699 (or 20695 counting only the distinct ones).

The product of its digits is 2400, while the sum is 25.

The square root of 165544 is about 406.8709869234. The cubic root of 165544 is about 54.9082768711.

The spelling of 165544 in words is "one hundred sixty-five thousand, five hundred forty-four".