866441063512784 has 80 divisors (see below), whose sum is σ = 1704507377164800. Its totient is φ = 426597609664512.

The previous prime is 866441063512781. The next prime is 866441063512841. The reversal of 866441063512784 is 487215360144668.

It is a self number, because there is not a number n which added to its sum of digits gives 866441063512784.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866441063512781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5711956589 + ... + 5712108275.

It is an arithmetic number, because the mean of its divisors is an integer number (21306342214560).

Almost surely, 2^{866441063512784} is an apocalyptic number.

It is an amenable number.

866441063512784 is a deficient number, since it is larger than the sum of its proper divisors (838066313652016).

866441063512784 is a wasteful number, since it uses less digits than its factorization.

866441063512784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163780 (or 163774 counting only the distinct ones).

The product of its (nonzero) digits is 185794560, while the sum is 65.

The spelling of 866441063512784 in words is "eight hundred sixty-six trillion, four hundred forty-one billion, sixty-three million, five hundred twelve thousand, seven hundred eighty-four".