866439859105739 has 2 divisors, whose sum is σ = 866439859105740. Its totient is φ = 866439859105738.

The previous prime is 866439859105729. The next prime is 866439859105759. The reversal of 866439859105739 is 937501958934668.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 866439859105739 - 2¹² = 866439859101643 is a prime.

It is a super-2 number, since 2×866439859105739² (a number of 31 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (866439859105729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433219929552869 + 433219929552870.

It is an arithmetic number, because the mean of its divisors is an integer number (433219929552870).

Almost surely, 2^{866439859105739} is an apocalyptic number.

866439859105739 is a deficient number, since it is larger than the sum of its proper divisors (1).

866439859105739 is an equidigital number, since it uses as much as digits as its factorization.

866439859105739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10581580800, while the sum is 83.

The spelling of 866439859105739 in words is "eight hundred sixty-six trillion, four hundred thirty-nine billion, eight hundred fifty-nine million, one hundred five thousand, seven hundred thirty-nine".