866802655171643 has 2 divisors, whose sum is σ = 866802655171644. Its totient is φ = 866802655171642.

The previous prime is 866802655171529. The next prime is 866802655171681. The reversal of 866802655171643 is 346171556208668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866802655171643 - 2⁴⁰ = 865703143543867 is a prime.

It is a super-2 number, since 2×866802655171643² (a number of 31 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (866802655161643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433401327585821 + 433401327585822.

It is an arithmetic number, because the mean of its divisors is an integer number (433401327585822).

Almost surely, 2^{866802655171643} is an apocalyptic number.

866802655171643 is a deficient number, since it is larger than the sum of its proper divisors (1).

866802655171643 is an equidigital number, since it uses as much as digits as its factorization.

866802655171643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 348364800, while the sum is 68.

The spelling of 866802655171643 in words is "eight hundred sixty-six trillion, eight hundred two billion, six hundred fifty-five million, one hundred seventy-one thousand, six hundred forty-three".