866287949782668 has 144 divisors (see below), whose sum is σ = 2415010806361440. Its totient is φ = 240810618553344.

The previous prime is 866287949782637. The next prime is 866287949782709.

866287949782668 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 493180296 + ... + 494933712.

It is an arithmetic number, because the mean of its divisors is an integer number (16770908377510).

Almost surely, 2^{866287949782668} 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 866287949782668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1207505403180720).

866287949782668 is an abundant number, since it is smaller than the sum of its proper divisors (1548722856578772).

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

866287949782668 is a wasteful number, since it uses less digits than its factorization.

866287949782668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776184 (or 1776175 counting only the distinct ones).

The product of its digits is 337105649664, while the sum is 96.

The spelling of 866287949782668 in words is "eight hundred sixty-six trillion, two hundred eighty-seven billion, nine hundred forty-nine million, seven hundred eighty-two thousand, six hundred sixty-eight".