166441771 has 4 divisors (see below), whose sum is σ = 166493952. Its totient is φ = 166389592.

The previous prime is 166441763. The next prime is 166441787. The reversal of 166441771 is 177144661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 177144661 = 367 ⋅482683.

It is a cyclic number.

It is not a de Polignac number, because 166441771 - 2³ = 166441763 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166441771.

It is not an unprimeable number, because it can be changed into a prime (166441721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20971 + ... + 27796.

It is an arithmetic number, because the mean of its divisors is an integer number (41623488).

Almost surely, 2^166441771 is an apocalyptic number.

166441771 is a deficient number, since it is larger than the sum of its proper divisors (52181).

166441771 is an equidigital number, since it uses as much as digits as its factorization.

166441771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52180.

The product of its digits is 28224, while the sum is 37.

The square root of 166441771 is about 12901.2313753378. The cubic root of 166441771 is about 550.0735670189.

The spelling of 166441771 in words is "one hundred sixty-six million, four hundred forty-one thousand, seven hundred seventy-one".