866788526215853 has 2 divisors, whose sum is σ = 866788526215854. Its totient is φ = 866788526215852.

The previous prime is 866788526215831. The next prime is 866788526215889. The reversal of 866788526215853 is 358512625887668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 796359538944649 + 70428987271204 = 28219843^2 + 8392198^2 .

It is a cyclic number.

It is not a de Polignac number, because 866788526215853 - 2⁸ = 866788526215597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866788526215153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433394263107926 + 433394263107927.

It is an arithmetic number, because the mean of its divisors is an integer number (433394263107927).

Almost surely, 2^{866788526215853} is an apocalyptic number.

It is an amenable number.

866788526215853 is a deficient number, since it is larger than the sum of its proper divisors (1).

866788526215853 is an equidigital number, since it uses as much as digits as its factorization.

866788526215853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9289728000, while the sum is 80.

The spelling of 866788526215853 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, five hundred twenty-six million, two hundred fifteen thousand, eight hundred fifty-three".