166089889 has 16 divisors (see below), whose sum is σ = 192826368. Its totient is φ = 140119632.

The previous prime is 166089871. The next prime is 166089907. The reversal of 166089889 is 988980661.

It is an interprime number because it is at equal distance from previous prime (166089871) and next prime (166089907).

It is a cyclic number.

It is not a de Polignac number, because 166089889 - 2⁵ = 166089857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166089839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 282654 + ... + 283240.

It is an arithmetic number, because the mean of its divisors is an integer number (12051648).

Almost surely, 2^166089889 is an apocalyptic number.

It is an amenable number.

166089889 is a deficient number, since it is larger than the sum of its proper divisors (26736479).

166089889 is an equidigital number, since it uses as much as digits as its factorization.

166089889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164.

The product of its (nonzero) digits is 1492992, while the sum is 55.

The square root of 166089889 is about 12887.5866243451. The cubic root of 166089889 is about 549.6856484663.

The spelling of 166089889 in words is "one hundred sixty-six million, eighty-nine thousand, eight hundred eighty-nine".