166109441 has 4 divisors (see below), whose sum is σ = 167377584. Its totient is φ = 164841300.

The previous prime is 166109423. The next prime is 166109443. The reversal of 166109441 is 144901661.

It is a happy number.

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: 144901661 = 29 ⋅4996609.

It is a cyclic number.

It is not a de Polignac number, because 166109441 - 2¹⁰ = 166108417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 166109398 and 166109407.

It is not an unprimeable number, because it can be changed into a prime (166109443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 633875 + ... + 634136.

It is an arithmetic number, because the mean of its divisors is an integer number (41844396).

Almost surely, 2^166109441 is an apocalyptic number.

It is an amenable number.

166109441 is a deficient number, since it is larger than the sum of its proper divisors (1268143).

166109441 is a wasteful number, since it uses less digits than its factorization.

166109441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1268142.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 166109441 is about 12888.3451614239. The cubic root of 166109441 is about 549.7072171726.

The spelling of 166109441 in words is "one hundred sixty-six million, one hundred nine thousand, four hundred forty-one".