2206111666 has 16 divisors (see below), whose sum is σ = 3638430720. Its totient is φ = 994880880.

The previous prime is 2206111651. The next prime is 2206111669. The reversal of 2206111666 is 6661116022.

It is a super-2 number, since 2×2206111666² = 9733857365722591112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2206111669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 392001 + ... + 397588.

It is an arithmetic number, because the mean of its divisors is an integer number (227401920).

Almost surely, 2^2206111666 is an apocalyptic number.

2206111666 is a deficient number, since it is larger than the sum of its proper divisors (1432319054).

2206111666 is a wasteful number, since it uses less digits than its factorization.

2206111666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789729.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 2206111666 is about 46969.2629918759. The cubic root of 2206111666 is about 1301.7946940051.

Adding to 2206111666 its reverse (6661116022), we get a palindrome (8867227688).

The spelling of 2206111666 in words is "two billion, two hundred six million, one hundred eleven thousand, six hundred sixty-six".