866820666882 has 32 divisors (see below), whose sum is σ = 1745997612480. Its totient is φ = 286885789760.

The previous prime is 866820666871. The next prime is 866820666883. The reversal of 866820666882 is 288666028668.

It is not an unprimeable number, because it can be changed into a prime (866820666883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83332 + ... + 1319312.

It is an arithmetic number, because the mean of its divisors is an integer number (54562425390).

Almost surely, 2^866820666882 is an apocalyptic number.

866820666882 is an abundant number, since it is smaller than the sum of its proper divisors (879176945598).

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

866820666882 is a wasteful number, since it uses less digits than its factorization.

866820666882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236818.

The product of its (nonzero) digits is 127401984, while the sum is 66.

The spelling of 866820666882 in words is "eight hundred sixty-six billion, eight hundred twenty million, six hundred sixty-six thousand, eight hundred eighty-two".