866543841 has 24 divisors (see below), whose sum is σ = 1290781440. Its totient is φ = 559886976.

The previous prime is 866543831. The next prime is 866543861. The reversal of 866543841 is 148345668.

866543841 is a `hidden beast` number, since 8 + 66 + 543 + 8 + 41 = 666.

866543841 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-866543841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (866543831) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33625 + ... + 53513.

It is an arithmetic number, because the mean of its divisors is an integer number (53782560).

Almost surely, 2^866543841 is an apocalyptic number.

It is an amenable number.

866543841 is a deficient number, since it is larger than the sum of its proper divisors (424237599).

866543841 is a wasteful number, since it uses less digits than its factorization.

866543841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20045 (or 20042 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 866543841 is about 29437.1167236195. The cubic root of 866543841 is about 953.3744597181.

The spelling of 866543841 in words is "eight hundred sixty-six million, five hundred forty-three thousand, eight hundred forty-one".