866788810116571 has 4 divisors (see below), whose sum is σ = 866789921158632. Its totient is φ = 866787699074512.

The previous prime is 866788810116539. The next prime is 866788810116583. The reversal of 866788810116571 is 175611018887668.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 866788810116571 - 2⁵ = 866788810116539 is a prime.

It is a super-3 number, since 3×866788810116571³ (a number of 46 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 866788810116494 and 866788810116503.

It is not an unprimeable number, because it can be changed into a prime (866788810116371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 554349970 + ... + 555911383.

It is an arithmetic number, because the mean of its divisors is an integer number (216697480289658).

Almost surely, 2^{866788810116571} is an apocalyptic number.

866788810116571 is a deficient number, since it is larger than the sum of its proper divisors (1111042061).

866788810116571 is a wasteful number, since it uses less digits than its factorization.

866788810116571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111042060.

The product of its (nonzero) digits is 216760320, while the sum is 73.

The spelling of 866788810116571 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, eight hundred ten million, one hundred sixteen thousand, five hundred seventy-one".