8666878786669 has 4 divisors (see below), whose sum is σ = 8691855382944. Its totient is φ = 8641902190396.

The previous prime is 8666878786651. The next prime is 8666878786717. The reversal of 8666878786669 is 9666878786668.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8666878786669 - 2⁷ = 8666878786541 is a prime.

It is a super-2 number, since 2×8666878786669² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8666878786609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12488297617 + ... + 12488298310.

It is an arithmetic number, because the mean of its divisors is an integer number (2172963845736).

Almost surely, 2^{8666878786669} is an apocalyptic number.

It is an amenable number.

8666878786669 is a deficient number, since it is larger than the sum of its proper divisors (24976596275).

8666878786669 is a wasteful number, since it uses less digits than its factorization.

8666878786669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24976596274.

The product of its digits is 84276412416, while the sum is 91.

Subtracting 8666878786669 from its reverse (9666878786668), we obtain a palindrome (999999999999).

The spelling of 8666878786669 in words is "eight trillion, six hundred sixty-six billion, eight hundred seventy-eight million, seven hundred eighty-six thousand, six hundred sixty-nine".