866786235086784 has 56 divisors (see below), whose sum is σ = 2321002900621440. Its totient is φ = 285447675806464.

The previous prime is 866786235086743. The next prime is 866786235086803. The reversal of 866786235086784 is 487680532687668.

It is a super-2 number, since 2×866786235086784² (a number of 31 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 866786235086697 and 866786235086706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27195837324 + ... + 27195869195.

It is an arithmetic number, because the mean of its divisors is an integer number (41446480368240).

Almost surely, 2^{866786235086784} is an apocalyptic number.

It is an amenable number.

866786235086784 is an abundant number, since it is smaller than the sum of its proper divisors (1454216665534656).

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

866786235086784 is a wasteful number, since it uses less digits than its factorization.

866786235086784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54391706617 (or 54391706607 counting only the distinct ones).

The product of its (nonzero) digits is 31213486080, while the sum is 84.

The spelling of 866786235086784 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred thirty-five million, eighty-six thousand, seven hundred eighty-four".