866937795989 has 2 divisors, whose sum is σ = 866937795990. Its totient is φ = 866937795988.

The previous prime is 866937795967. The next prime is 866937796103. The reversal of 866937795989 is 989597739668.

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., 831981136900 + 34956659089 = 912130^2 + 186967^2 .

It is a cyclic number.

It is not a de Polignac number, because 866937795989 - 2⁸ = 866937795733 is a prime.

It is a super-2 number, since 2×866937795989² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 866937795989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866937795959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433468897994 + 433468897995.

It is an arithmetic number, because the mean of its divisors is an integer number (433468897995).

Almost surely, 2^866937795989 is an apocalyptic number.

It is an amenable number.

866937795989 is a deficient number, since it is larger than the sum of its proper divisors (1).

866937795989 is an equidigital number, since it uses as much as digits as its factorization.

866937795989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11110659840, while the sum is 86.

The spelling of 866937795989 in words is "eight hundred sixty-six billion, nine hundred thirty-seven million, seven hundred ninety-five thousand, nine hundred eighty-nine".