18000011111 has 8 divisors (see below), whose sum is σ = 19169005104. Its totient is φ = 16843258240.

The previous prime is 18000011069. The next prime is 18000011129. The reversal of 18000011111 is 11111000081.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18000011111 is a prime.

It is a super-2 number, since 2×18000011111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18000011311) 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, 3057245 + ... + 3063126.

It is an arithmetic number, because the mean of its divisors is an integer number (2396125638).

Almost surely, 2^18000011111 is an apocalyptic number.

18000011111 is a deficient number, since it is larger than the sum of its proper divisors (1168993993).

18000011111 is a wasteful number, since it uses less digits than its factorization.

18000011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6120561.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 18000011111 its reverse (11111000081), we get a palindrome (29111011192).

The spelling of 18000011111 in words is "eighteen billion, eleven thousand, one hundred eleven".