12111555166 has 4 divisors (see below), whose sum is σ = 18167332752. Its totient is φ = 6055777582.

The previous prime is 12111555163. The next prime is 12111555167. The reversal of 12111555166 is 66155511121.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×12111555166² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111555163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3027888790 + ... + 3027888793.

It is an arithmetic number, because the mean of its divisors is an integer number (4541833188).

Almost surely, 2^12111555166 is an apocalyptic number.

12111555166 is a deficient number, since it is larger than the sum of its proper divisors (6055777586).

12111555166 is an equidigital number, since it uses as much as digits as its factorization.

12111555166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6055777585.

The product of its digits is 9000, while the sum is 34.

The spelling of 12111555166 in words is "twelve billion, one hundred eleven million, five hundred fifty-five thousand, one hundred sixty-six".