866027278256 has 80 divisors (see below), whose sum is σ = 1949462274048. Its totient is φ = 364996281600.

The previous prime is 866027278243. The next prime is 866027278261. The reversal of 866027278256 is 652872720668.

It is a junction number, because it is equal to n+sod(n) for n = 866027278195 and 866027278204.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45785441 + ... + 45804351.

Almost surely, 2^866027278256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866027278256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (974731137024).

866027278256 is an abundant number, since it is smaller than the sum of its proper divisors (1083434995792).

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

866027278256 is a wasteful number, since it uses less digits than its factorization.

866027278256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25690 (or 25684 counting only the distinct ones).

The product of its (nonzero) digits is 27095040, while the sum is 59.

The spelling of 866027278256 in words is "eight hundred sixty-six billion, twenty-seven million, two hundred seventy-eight thousand, two hundred fifty-six".