111100111111111 has 2 divisors, whose sum is σ = 111100111111112. Its totient is φ = 111100111111110.

The previous prime is 111100111111063. The next prime is 111100111111151. The reversal of 111100111111111 is 111111111001111.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111100111111111 - 2¹³ = 111100111102919 is a prime.

111100111111111 is a modest number, since divided by 11111111 gives 1111001 as remainder.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 111100111111091 and 111100111111100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111100111111151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55550055555555 + 55550055555556.

It is an arithmetic number, because the mean of its divisors is an integer number (55550055555556).

Almost surely, 2^{111100111111111} is an apocalyptic number.

111100111111111 is a deficient number, since it is larger than the sum of its proper divisors (1).

111100111111111 is an equidigital number, since it uses as much as digits as its factorization.

111100111111111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1, while the sum is 13.

Adding to 111100111111111 its reverse (111111111001111), we get a palindrome (222211222112222).

It can be divided in two parts, 1111001111 and 11111, that multiplied together give a palindrome (12344333344321).

The spelling of 111100111111111 in words is "one hundred eleven trillion, one hundred billion, one hundred eleven million, one hundred eleven thousand, one hundred eleven".