85666189 has 4 divisors (see below), whose sum is σ = 97904224. Its totient is φ = 73428156.

The previous prime is 85666187. The next prime is 85666219. The reversal of 85666189 is 98166658.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 85666189 - 2¹ = 85666187 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85666187) 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 3 ways as a sum of consecutive naturals, for example, 6119007 + ... + 6119020.

It is an arithmetic number, because the mean of its divisors is an integer number (24476056).

Almost surely, 2^85666189 is an apocalyptic number.

It is an amenable number.

85666189 is a deficient number, since it is larger than the sum of its proper divisors (12238035).

85666189 is a wasteful number, since it uses less digits than its factorization.

85666189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12238034.

The product of its digits is 622080, while the sum is 49.

The square root of 85666189 is about 9255.6031137900. The cubic root of 85666189 is about 440.8286536342.

The spelling of 85666189 in words is "eighty-five million, six hundred sixty-six thousand, one hundred eighty-nine".