166441 has 4 divisors (see below), whose sum is σ = 181584. Its totient is φ = 151300.

The previous prime is 166429. The next prime is 166457. The reversal of 166441 is 144661.

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, and also an emirpimes, since its reverse is a distinct semiprime: 144661 = 11 ⋅13151.

It is a cyclic number.

It is not a de Polignac number, because 166441 - 2⁵ = 166409 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (166471) 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 in 3 ways as a sum of consecutive naturals, for example, 7555 + ... + 7576.

It is an arithmetic number, because the mean of its divisors is an integer number (45396).

2¹⁶⁶⁴⁴¹ is an apocalyptic number.

166441 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166441 is a deficient number, since it is larger than the sum of its proper divisors (15143).

166441 is a wasteful number, since it uses less digits than its factorization.

166441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15142.

The product of its digits is 576, while the sum is 22.

The square root of 166441 is about 407.9718127518. The cubic root of 166441 is about 55.0072717658.

The spelling of 166441 in words is "one hundred sixty-six thousand, four hundred forty-one".