165545 has 8 divisors (see below), whose sum is σ = 201096. Its totient is φ = 130816.

The previous prime is 165541. The next prime is 165551. The reversal of 165545 is 545561.

It can be written as a sum of positive squares in 4 ways, for example, as 11881 + 153664 = 109^2 + 392^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 165545 - 2² = 165541 is a prime.

It is a Duffinian number.

It is a plaindrome 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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 419 + ... + 711.

It is an arithmetic number, because the mean of its divisors is an integer number (25137).

2¹⁶⁵⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

165545 is a deficient number, since it is larger than the sum of its proper divisors (35551).

165545 is a wasteful number, since it uses less digits than its factorization.

165545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411.

The product of its digits is 3000, while the sum is 26.

The square root of 165545 is about 406.8722158123. The cubic root of 165545 is about 54.9083874321.

The spelling of 165545 in words is "one hundred sixty-five thousand, five hundred forty-five".