866123878663813 has 8 divisors (see below), whose sum is σ = 1079842757814720. Its totient is φ = 674901723634080.

The previous prime is 866123878663741. The next prime is 866123878663903. The reversal of 866123878663813 is 318366878321668.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 866123878663813 - 2³³ = 866115288729221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 866123878663813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866123878663313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5624181030208 + ... + 5624181030361.

It is an arithmetic number, because the mean of its divisors is an integer number (134980344726840).

Almost surely, 2^{866123878663813} is an apocalyptic number.

It is an amenable number.

866123878663813 is a deficient number, since it is larger than the sum of its proper divisors (213718879150907).

866123878663813 is a wasteful number, since it uses less digits than its factorization.

866123878663813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11248362060587.

The product of its digits is 2006581248, while the sum is 76.

The spelling of 866123878663813 in words is "eight hundred sixty-six trillion, one hundred twenty-three billion, eight hundred seventy-eight million, six hundred sixty-three thousand, eight hundred thirteen".