866040223 has 6 divisors (see below), whose sum is σ = 869255016. Its totient is φ = 862837272.

The previous prime is 866040209. The next prime is 866040247. The reversal of 866040223 is 322040668.

It is a de Polignac number, because none of the positive numbers 2^k-866040223 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 (866040523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71086 + ... + 82372.

It is an arithmetic number, because the mean of its divisors is an integer number (144875836).

Almost surely, 2^866040223 is an apocalyptic number.

866040223 is a deficient number, since it is larger than the sum of its proper divisors (3214793).

866040223 is an equidigital number, since it uses as much as digits as its factorization.

866040223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11841 (or 11564 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 866040223 is about 29428.5613477791. The cubic root of 866040223 is about 953.1897298517.

The spelling of 866040223 in words is "eight hundred sixty-six million, forty thousand, two hundred twenty-three".