85666911 has 12 divisors (see below), whose sum is σ = 125550936. Its totient is φ = 51919120.

The previous prime is 85666909. The next prime is 85666939. The reversal of 85666911 is 11966658.

It is a happy number.

It is not a de Polignac number, because 85666911 - 2¹ = 85666909 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85666901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117636 + ... + 118361.

It is an arithmetic number, because the mean of its divisors is an integer number (10462578).

Almost surely, 2^85666911 is an apocalyptic number.

85666911 is a deficient number, since it is larger than the sum of its proper divisors (39884025).

85666911 is a wasteful number, since it uses less digits than its factorization.

85666911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236022 (or 236011 counting only the distinct ones).

The product of its digits is 77760, while the sum is 42.

The square root of 85666911 is about 9255.6421171089. The cubic root of 85666911 is about 440.8298920746.

The spelling of 85666911 in words is "eighty-five million, six hundred sixty-six thousand, nine hundred eleven".