866421028223 has 2 divisors, whose sum is σ = 866421028224. Its totient is φ = 866421028222.

The previous prime is 866421028171. The next prime is 866421028271. The reversal of 866421028223 is 322820124668.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866421028223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866421028283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433210514111 + 433210514112.

It is an arithmetic number, because the mean of its divisors is an integer number (433210514112).

Almost surely, 2^866421028223 is an apocalyptic number.

866421028223 is a deficient number, since it is larger than the sum of its proper divisors (1).

866421028223 is an equidigital number, since it uses as much as digits as its factorization.

866421028223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 442368, while the sum is 44.

The spelling of 866421028223 in words is "eight hundred sixty-six billion, four hundred twenty-one million, twenty-eight thousand, two hundred twenty-three".