999988654220111 has 2 divisors, whose sum is σ = 999988654220112. Its totient is φ = 999988654220110.

The previous prime is 999988654220077. The next prime is 999988654220113. The reversal of 999988654220111 is 111022456889999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999988654220111 - 2⁶ = 999988654220047 is a prime.

Together with 999988654220113, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999988654220113) 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 as a sum of consecutive naturals, namely, 499994327110055 + 499994327110056.

It is an arithmetic number, because the mean of its divisors is an integer number (499994327110056).

Almost surely, 2^{999988654220111} is an apocalyptic number.

999988654220111 is a deficient number, since it is larger than the sum of its proper divisors (1).

999988654220111 is an equidigital number, since it uses as much as digits as its factorization.

999988654220111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201553920, while the sum is 74.

The spelling of 999988654220111 in words is "nine hundred ninety-nine trillion, nine hundred eighty-eight billion, six hundred fifty-four million, two hundred twenty thousand, one hundred eleven".