866845843 has 2 divisors, whose sum is σ = 866845844. Its totient is φ = 866845842.

The previous prime is 866845801. The next prime is 866845853. The reversal of 866845843 is 348548668.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866845843 is a prime.

It is not a weakly prime, because it can be changed into another prime (866845853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433422921 + 433422922.

It is an arithmetic number, because the mean of its divisors is an integer number (433422922).

Almost surely, 2^866845843 is an apocalyptic number.

866845843 is a deficient number, since it is larger than the sum of its proper divisors (1).

866845843 is an equidigital number, since it uses as much as digits as its factorization.

866845843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4423680, while the sum is 52.

The square root of 866845843 is about 29442.2458891981. The cubic root of 866845843 is about 953.4852013941.

The spelling of 866845843 in words is "eight hundred sixty-six million, eight hundred forty-five thousand, eight hundred forty-three".