166890089 has 2 divisors, whose sum is σ = 166890090. Its totient is φ = 166890088.

The previous prime is 166890079. The next prime is 166890103. The reversal of 166890089 is 980098661.

166890089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159643225 + 7246864 = 12635^2 + 2692^2 .

It is a cyclic number.

It is not a de Polignac number, because 166890089 - 2²⁰ = 165841513 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (166890029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83445044 + 83445045.

It is an arithmetic number, because the mean of its divisors is an integer number (83445045).

Almost surely, 2^166890089 is an apocalyptic number.

It is an amenable number.

166890089 is a deficient number, since it is larger than the sum of its proper divisors (1).

166890089 is an equidigital number, since it uses as much as digits as its factorization.

166890089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 166890089 is about 12918.5946991149. The cubic root of 166890089 is about 550.5670064450.

The spelling of 166890089 in words is "one hundred sixty-six million, eight hundred ninety thousand, eighty-nine".