856069866 has 12 divisors (see below), whose sum is σ = 1854818082. Its totient is φ = 285356616.

The previous prime is 856069861. The next prime is 856069919. The reversal of 856069866 is 668960658.

856069866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 848032641 + 8037225 = 29121^2 + 2835^2 .

It is not an unprimeable number, because it can be changed into a prime (856069861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23779701 + ... + 23779736.

Almost surely, 2^856069866 is an apocalyptic number.

856069866 is an abundant number, since it is smaller than the sum of its proper divisors (998748216).

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

856069866 is a wasteful number, since it uses less digits than its factorization.

856069866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47559445 (or 47559442 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 54.

The square root of 856069866 is about 29258.6716376530. The cubic root of 856069866 is about 949.5177112448.

The spelling of 856069866 in words is "eight hundred fifty-six million, sixty-nine thousand, eight hundred sixty-six".