12206111666 has 32 divisors (see below), whose sum is σ = 21436462080. Its totient is φ = 5103551376.

The previous prime is 12206111627. The next prime is 12206111669. The reversal of 12206111666 is 66611160221.

It is a super-2 number, since 2×12206111666² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12206111669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 522545 + ... + 545403.

It is an arithmetic number, because the mean of its divisors is an integer number (669889440).

Almost surely, 2^12206111666 is an apocalyptic number.

12206111666 is a deficient number, since it is larger than the sum of its proper divisors (9230350414).

12206111666 is a wasteful number, since it uses less digits than its factorization.

12206111666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23798.

The product of its (nonzero) digits is 5184, while the sum is 32.

Adding to 12206111666 its reverse (66611160221), we get a palindrome (78817271887).

The spelling of 12206111666 in words is "twelve billion, two hundred six million, one hundred eleven thousand, six hundred sixty-six".