866189945779 has 2 divisors, whose sum is σ = 866189945780. Its totient is φ = 866189945778.

The previous prime is 866189945741. The next prime is 866189945851. The reversal of 866189945779 is 977549981668.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 866189945779 - 2⁷ = 866189945651 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 866189945699 and 866189945708.

It is not a weakly prime, because it can be changed into another prime (866189945279) 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, 433094972889 + 433094972890.

It is an arithmetic number, because the mean of its divisors is an integer number (433094972890).

Almost surely, 2^866189945779 is an apocalyptic number.

866189945779 is a deficient number, since it is larger than the sum of its proper divisors (1).

866189945779 is an equidigital number, since it uses as much as digits as its factorization.

866189945779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1646023680, while the sum is 79.

The spelling of 866189945779 in words is "eight hundred sixty-six billion, one hundred eighty-nine million, nine hundred forty-five thousand, seven hundred seventy-nine".