866642881002 has 32 divisors (see below), whose sum is σ = 1756609182720. Its totient is φ = 285003408240.

The previous prime is 866642881001. The next prime is 866642881021. The reversal of 866642881002 is 200188246668.

It is not an unprimeable number, because it can be changed into a prime (866642881001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 852124 + ... + 1568247.

It is an arithmetic number, because the mean of its divisors is an integer number (54894036960).

Almost surely, 2^866642881002 is an apocalyptic number.

866642881002 is an abundant number, since it is smaller than the sum of its proper divisors (889966301718).

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

866642881002 is a wasteful number, since it uses less digits than its factorization.

866642881002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2421178.

The product of its (nonzero) digits is 1769472, while the sum is 51.

The spelling of 866642881002 in words is "eight hundred sixty-six billion, six hundred forty-two million, eight hundred eighty-one thousand, two".