111999999999 has 8 divisors (see below), whose sum is σ = 153369369520. Its totient is φ = 72648648576.

The previous prime is 111999999989. The next prime is 112000000003. The reversal of 111999999999 is 999999999111.

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

It is not a de Polignac number, because 111999999999 - 2⁴ = 111999999983 is a prime.

It is a Duffinian number.

111999999999 is a modest number, since divided by 999999 gives 111999 as remainder.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111999999959) 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, 504504394 + ... + 504504615.

It is an arithmetic number, because the mean of its divisors is an integer number (19171171190).

Almost surely, 2^111999999999 is an apocalyptic number.

111999999999 is a deficient number, since it is larger than the sum of its proper divisors (41369369521).

111999999999 is a wasteful number, since it uses less digits than its factorization.

111999999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009009049.

The product of its digits is 387420489, while the sum is 84.

The spelling of 111999999999 in words is "one hundred eleven billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".