866936639668 has 24 divisors (see below), whose sum is σ = 1659498049440. Its totient is φ = 393005634720.

The previous prime is 866936639659. The next prime is 866936639683.

866936639668 is nontrivially palindromic in base 10.

866936639668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 866936639594 and 866936639603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26395258 + ... + 26428081.

It is an arithmetic number, because the mean of its divisors is an integer number (69145752060).

Almost surely, 2^866936639668 is an apocalyptic number.

It is an amenable number.

866936639668 is a deficient number, since it is larger than the sum of its proper divisors (792561409772).

866936639668 is a wasteful number, since it uses less digits than its factorization.

866936639668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52823727 (or 52823725 counting only the distinct ones).

The product of its digits is 2176782336, while the sum is 76.

The spelling of 866936639668 in words is "eight hundred sixty-six billion, nine hundred thirty-six million, six hundred thirty-nine thousand, six hundred sixty-eight".