85666 has 16 divisors (see below), whose sum is σ = 152640. Its totient is φ = 35280.

The previous prime is 85661. The next prime is 85667. The reversal of 85666 is 66658.

It is not an unprimeable number, because it can be changed into a prime (85661) by changing a digit.

85666 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301 + ... + 511.

It is an arithmetic number, because the mean of its divisors is an integer number (9540).

2⁸⁵⁶⁶⁶ is an apocalyptic number.

85666 is a deficient number, since it is larger than the sum of its proper divisors (66974).

85666 is a wasteful number, since it uses less digits than its factorization.

85666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249.

The product of its digits is 8640, while the sum is 31.

The square root of 85666 is about 292.6875467115. The cubic root of 85666 is about 44.0828329443.

The spelling of 85666 in words is "eighty-five thousand, six hundred sixty-six".