11111100999989 has 2 divisors, whose sum is σ = 11111100999990. Its totient is φ = 11111100999988.

The previous prime is 11111100999961. The next prime is 11111101000003. The reversal of 11111100999989 is 98999900111111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6721937728900 + 4389163271089 = 2592670^2 + 2095033^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11111100999989 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11111100999389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555550499994 + 5555550499995.

It is an arithmetic number, because the mean of its divisors is an integer number (5555550499995).

Almost surely, 2^{11111100999989} is an apocalyptic number.

It is an amenable number.

11111100999989 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111100999989 is an equidigital number, since it uses as much as digits as its factorization.

11111100999989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 472392, while the sum is 59.

The spelling of 11111100999989 in words is "eleven trillion, one hundred eleven billion, one hundred million, nine hundred ninety-nine thousand, nine hundred eighty-nine".