111611111111111 has 8 divisors (see below), whose sum is σ = 112140473979648. Its totient is φ = 111081752019000.

The previous prime is 111611111111107. The next prime is 111611111111141. The reversal of 111611111111111 is 111111111116111.

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

It is a cyclic number.

It is not a de Polignac number, because 111611111111111 - 2² = 111611111111107 is a prime.

It is a Duffinian number.

111611111111111 is a modest number, since divided by 11111111 gives 1116111 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111611111111141) 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, 71429396 + ... + 72975206.

It is an arithmetic number, because the mean of its divisors is an integer number (14017559247456).

Almost surely, 2^{111611111111111} is an apocalyptic number.

111611111111111 is a deficient number, since it is larger than the sum of its proper divisors (529362868537).

111611111111111 is a wasteful number, since it uses less digits than its factorization.

111611111111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1888213.

The product of its digits is 6, while the sum is 20.

Adding to 111611111111111 its reverse (111111111116111), we get a palindrome (222722222227222).

The spelling of 111611111111111 in words is "one hundred eleven trillion, six hundred eleven billion, one hundred eleven million, one hundred eleven thousand, one hundred eleven".