2211163866 has 48 divisors (see below), whose sum is σ = 5036673600. Its totient is φ = 719048160.

The previous prime is 2211163849. The next prime is 2211163891. The reversal of 2211163866 is 6683611122.

It is a happy number.

2211163866 is a `hidden beast` number, since 2 + 2 + 1 + 11 + 638 + 6 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 2211163866.

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, 78595 + ... + 102953.

It is an arithmetic number, because the mean of its divisors is an integer number (104930700).

Almost surely, 2^2211163866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2211163866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2518336800).

2211163866 is an abundant number, since it is smaller than the sum of its proper divisors (2825509734).

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

2211163866 is a wasteful number, since it uses less digits than its factorization.

2211163866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24452 (or 24405 counting only the distinct ones).

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

The square root of 2211163866 is about 47023.0142164451. The cubic root of 2211163866 is about 1302.7876798455.

Adding to 2211163866 its reverse (6683611122), we get a palindrome (8894774988).

The spelling of 2211163866 in words is "two billion, two hundred eleven million, one hundred sixty-three thousand, eight hundred sixty-six".