866872278668 has 72 divisors (see below), whose sum is σ = 1765046404800. Its totient is φ = 371208134880.

The previous prime is 866872278659. The next prime is 866872278703.

866872278668 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 866872278595 and 866872278604.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1382771 + ... + 1909397.

It is an arithmetic number, because the mean of its divisors is an integer number (24514533400).

Almost surely, 2^866872278668 is an apocalyptic number.

It is an amenable number.

866872278668 is an abundant number, since it is smaller than the sum of its proper divisors (898174126132).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866872278668 is a wasteful number, since it uses less digits than its factorization.

866872278668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526851 (or 526838 counting only the distinct ones).

The product of its digits is 1040449536, while the sum is 74.

The spelling of 866872278668 in words is "eight hundred sixty-six billion, eight hundred seventy-two million, two hundred seventy-eight thousand, six hundred sixty-eight".