866022643 has 2 divisors, whose sum is σ = 866022644. Its totient is φ = 866022642.

The previous prime is 866022617. The next prime is 866022649. The reversal of 866022643 is 346220668.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866022643 is a prime.

It is equal to p_44360488 and since 866022643 and 44360488 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (866022649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433011321 + 433011322.

It is an arithmetic number, because the mean of its divisors is an integer number (433011322).

Almost surely, 2^866022643 is an apocalyptic number.

866022643 is a deficient number, since it is larger than the sum of its proper divisors (1).

866022643 is an equidigital number, since it uses as much as digits as its factorization.

866022643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 37.

The square root of 866022643 is about 29428.2626568406. The cubic root of 866022643 is about 953.1832801170.

The spelling of 866022643 in words is "eight hundred sixty-six million, twenty-two thousand, six hundred forty-three".