866508188074871 has 2 divisors, whose sum is σ = 866508188074872. Its totient is φ = 866508188074870.

The previous prime is 866508188074799. The next prime is 866508188074877. The reversal of 866508188074871 is 178470881805668.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866508188074871 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 866508188074792 and 866508188074801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866508188074877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433254094037435 + 433254094037436.

It is an arithmetic number, because the mean of its divisors is an integer number (433254094037436).

Almost surely, 2^{866508188074871} is an apocalyptic number.

866508188074871 is a deficient number, since it is larger than the sum of its proper divisors (1).

866508188074871 is an equidigital number, since it uses as much as digits as its factorization.

866508188074871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1156055040, while the sum is 77.

The spelling of 866508188074871 in words is "eight hundred sixty-six trillion, five hundred eight billion, one hundred eighty-eight million, seventy-four thousand, eight hundred seventy-one".