866788528272647 has 2 divisors, whose sum is σ = 866788528272648. Its totient is φ = 866788528272646.

The previous prime is 866788528272631. The next prime is 866788528272697. The reversal of 866788528272647 is 746272825887668.

866788528272647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 866788528272647 - 2⁴ = 866788528272631 is a prime.

It is a super-2 number, since 2×866788528272647² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866788528272697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433394264136323 + 433394264136324.

It is an arithmetic number, because the mean of its divisors is an integer number (433394264136324).

Almost surely, 2^{866788528272647} is an apocalyptic number.

866788528272647 is a deficient number, since it is larger than the sum of its proper divisors (1).

866788528272647 is an equidigital number, since it uses as much as digits as its factorization.

866788528272647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48554311680, while the sum is 86.

The spelling of 866788528272647 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, five hundred twenty-eight million, two hundred seventy-two thousand, six hundred forty-seven".