866786257554593 has 2 divisors, whose sum is σ = 866786257554594. Its totient is φ = 866786257554592.

The previous prime is 866786257554491. The next prime is 866786257554661. The reversal of 866786257554593 is 395455752687668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 607467313509904 + 259318944044689 = 24646852^2 + 16103383^2 .

It is a cyclic number.

It is not a de Polignac number, because 866786257554593 - 2²⁶ = 866786190445729 is a prime.

It is not a weakly prime, because it can be changed into another prime (866786257550593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433393128777296 + 433393128777297.

It is an arithmetic number, because the mean of its divisors is an integer number (433393128777297).

Almost surely, 2^{866786257554593} is an apocalyptic number.

It is an amenable number.

866786257554593 is a deficient number, since it is larger than the sum of its proper divisors (1).

866786257554593 is an equidigital number, since it uses as much as digits as its factorization.

866786257554593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 91445760000, while the sum is 86.

The spelling of 866786257554593 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred fifty-seven million, five hundred fifty-four thousand, five hundred ninety-three".