866788547077728 has 144 divisors (see below), whose sum is σ = 2689033255376832. Its totient is φ = 262661361120000.

The previous prime is 866788547077703. The next prime is 866788547077741. The reversal of 866788547077728 is 827770745887668.

866788547077728 is a `hidden beast` number, since 8 + 6 + 67 + 8 + 8 + 5 + 470 + 7 + 7 + 72 + 8 = 666.

866788547077728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 492858183 + ... + 494613753.

It is an arithmetic number, because the mean of its divisors is an integer number (18673842051228).

Almost surely, 2^{866788547077728} is an apocalyptic number.

866788547077728 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

866788547077728 is an abundant number, since it is smaller than the sum of its proper divisors (1822244708299104).

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

866788547077728 is a wasteful number, since it uses less digits than its factorization.

866788547077728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911449 (or 1911438 counting only the distinct ones).

The product of its (nonzero) digits is 99131719680, while the sum is 90.

The spelling of 866788547077728 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, five hundred forty-seven million, seventy-seven thousand, seven hundred twenty-eight".