111555111605 has 16 divisors (see below), whose sum is σ = 155144657664. Its totient is φ = 75417538560.

The previous prime is 111555111583. The next prime is 111555111607. The reversal of 111555111605 is 506111555111.

It is not a de Polignac number, because 111555111605 - 2¹⁰ = 111555110581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111555111607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22443212 + ... + 22448181.

It is an arithmetic number, because the mean of its divisors is an integer number (9696541104).

Almost surely, 2^111555111605 is an apocalyptic number.

It is an amenable number.

111555111605 is a deficient number, since it is larger than the sum of its proper divisors (43589546059).

111555111605 is an equidigital number, since it uses as much as digits as its factorization.

111555111605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44891476.

The product of its (nonzero) digits is 3750, while the sum is 32.

Adding to 111555111605 its reverse (506111555111), we get a palindrome (617666666716).

The spelling of 111555111605 in words is "one hundred eleven billion, five hundred fifty-five million, one hundred eleven thousand, six hundred five".