866786257580093 has 2 divisors, whose sum is σ = 866786257580094. Its totient is φ = 866786257580092.

The previous prime is 866786257580059. The next prime is 866786257580203. The reversal of 866786257580093 is 390085752687668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 768105815537284 + 98680442042809 = 27714722^2 + 9933803^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866786257580093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866786257583093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433393128790046 + 433393128790047.

It is an arithmetic number, because the mean of its divisors is an integer number (433393128790047).

Almost surely, 2^{866786257580093} is an apocalyptic number.

It is an amenable number.

866786257580093 is a deficient number, since it is larger than the sum of its proper divisors (1).

866786257580093 is an equidigital number, since it uses as much as digits as its factorization.

866786257580093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7315660800, while the sum is 80.

The spelling of 866786257580093 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred fifty-seven million, five hundred eighty thousand, ninety-three".