166471891 has 4 divisors (see below), whose sum is σ = 171841984. Its totient is φ = 161101800.

The previous prime is 166471859. The next prime is 166471897. The reversal of 166471891 is 198174661.

166471891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166471891 - 2⁵ = 166471859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166471897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2685000 + ... + 2685061.

It is an arithmetic number, because the mean of its divisors is an integer number (42960496).

Almost surely, 2^166471891 is an apocalyptic number.

166471891 is a deficient number, since it is larger than the sum of its proper divisors (5370093).

166471891 is an equidigital number, since it uses as much as digits as its factorization.

166471891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5370092.

The product of its digits is 72576, while the sum is 43.

The square root of 166471891 is about 12902.3986529637. The cubic root of 166471891 is about 550.1067462231.

The spelling of 166471891 in words is "one hundred sixty-six million, four hundred seventy-one thousand, eight hundred ninety-one".