166666089 has 16 divisors (see below), whose sum is σ = 229091328. Its totient is φ = 107720592.

The previous prime is 166666069. The next prime is 166666111. The reversal of 166666089 is 980666661.

It is a happy number.

It is not a de Polignac number, because 166666089 - 2⁵ = 166666057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166666069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9564 + ... + 20610.

It is an arithmetic number, because the mean of its divisors is an integer number (14318208).

Almost surely, 2^166666089 is an apocalyptic number.

It is an amenable number.

166666089 is a deficient number, since it is larger than the sum of its proper divisors (62425239).

166666089 is a wasteful number, since it uses less digits than its factorization.

166666089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11204.

The product of its (nonzero) digits is 559872, while the sum is 48.

The square root of 166666089 is about 12909.9221144049. The cubic root of 166666089 is about 550.3205723439.

The spelling of 166666089 in words is "one hundred sixty-six million, six hundred sixty-six thousand, eighty-nine".