211066866 has 24 divisors (see below), whose sum is σ = 484212924. Its totient is φ = 66216960.

The previous prime is 211066861. The next prime is 211066873. The reversal of 211066866 is 668660112.

211066866 is digitally balanced in base 3, 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 2 ways, for example, as 205205625 + 5861241 = 14325^2 + 2421^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 211066866.

It is not an unprimeable number, because it can be changed into a prime (211066861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 344575 + ... + 345186.

Almost surely, 2^211066866 is an apocalyptic number.

211066866 is an abundant number, since it is smaller than the sum of its proper divisors (273146058).

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

211066866 is a wasteful number, since it uses less digits than its factorization.

211066866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689786 (or 689783 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 211066866 is about 14528.1404866555. The cubic root of 211066866 is about 595.3970619001.

It can be divided in two parts, 21106 and 6866, that added together give a palindrome (27972).

The spelling of 211066866 in words is "two hundred eleven million, sixty-six thousand, eight hundred sixty-six".