166484891 has 2 divisors, whose sum is σ = 166484892. Its totient is φ = 166484890.

The previous prime is 166484881. The next prime is 166484947. The reversal of 166484891 is 198484661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166484891 - 2⁶ = 166484827 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166484861) 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 as a sum of consecutive naturals, namely, 83242445 + 83242446.

It is an arithmetic number, because the mean of its divisors is an integer number (83242446).

Almost surely, 2^166484891 is an apocalyptic number.

166484891 is a deficient number, since it is larger than the sum of its proper divisors (1).

166484891 is an equidigital number, since it uses as much as digits as its factorization.

166484891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 331776, while the sum is 47.

The square root of 166484891 is about 12902.9024254235. The cubic root of 166484891 is about 550.1210653603.

The spelling of 166484891 in words is "one hundred sixty-six million, four hundred eighty-four thousand, eight hundred ninety-one".