866788526375441 has 2 divisors, whose sum is σ = 866788526375442. Its totient is φ = 866788526375440.

The previous prime is 866788526375437. The next prime is 866788526375449. The reversal of 866788526375441 is 144573625887668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 659683471964416 + 207105054411025 = 25684304^2 + 14391145^2 .

It is a cyclic number.

It is not a de Polignac number, because 866788526375441 - 2² = 866788526375437 is a prime.

It is a super-2 number, since 2×866788526375441² (a number of 31 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (866788526375449) 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, 433394263187720 + 433394263187721.

It is an arithmetic number, because the mean of its divisors is an integer number (433394263187721).

Almost surely, 2^{866788526375441} is an apocalyptic number.

It is an amenable number.

866788526375441 is a deficient number, since it is larger than the sum of its proper divisors (1).

866788526375441 is an equidigital number, since it uses as much as digits as its factorization.

866788526375441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13005619200, while the sum is 80.

The spelling of 866788526375441 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, five hundred twenty-six million, three hundred seventy-five thousand, four hundred forty-one".