866971384729 has 2 divisors, whose sum is σ = 866971384730. Its totient is φ = 866971384728.

The previous prime is 866971384723. The next prime is 866971384751. The reversal of 866971384729 is 927483179668.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 764622578329 + 102348806400 = 874427^2 + 319920^2 .

It is a cyclic number.

It is not a de Polignac number, because 866971384729 - 2¹⁷ = 866971253657 is a prime.

It is not a weakly prime, because it can be changed into another prime (866971384723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433485692364 + 433485692365.

It is an arithmetic number, because the mean of its divisors is an integer number (433485692365).

Almost surely, 2^866971384729 is an apocalyptic number.

It is an amenable number.

866971384729 is a deficient number, since it is larger than the sum of its proper divisors (1).

866971384729 is an equidigital number, since it uses as much as digits as its factorization.

866971384729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 219469824, while the sum is 70.

The spelling of 866971384729 in words is "eight hundred sixty-six billion, nine hundred seventy-one million, three hundred eighty-four thousand, seven hundred twenty-nine".