866785741712777 has 2 divisors, whose sum is σ = 866785741712778. Its totient is φ = 866785741712776.

The previous prime is 866785741712767. The next prime is 866785741712783. The reversal of 866785741712777 is 777217147587668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 457556955517561 + 409228786195216 = 21390581^2 + 20229404^2 .

It is a cyclic number.

It is not a de Polignac number, because 866785741712777 - 2⁴² = 862387695201673 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 866785741712695 and 866785741712704.

It is not a weakly prime, because it can be changed into another prime (866785741712767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433392870856388 + 433392870856389.

It is an arithmetic number, because the mean of its divisors is an integer number (433392870856389).

Almost surely, 2^{866785741712777} is an apocalyptic number.

It is an amenable number.

866785741712777 is a deficient number, since it is larger than the sum of its proper divisors (1).

866785741712777 is an equidigital number, since it uses as much as digits as its factorization.

866785741712777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10842531840, while the sum is 83.

The spelling of 866785741712777 in words is "eight hundred sixty-six trillion, seven hundred eighty-five billion, seven hundred forty-one million, seven hundred twelve thousand, seven hundred seventy-seven".