999998855111 has 2 divisors, whose sum is σ = 999998855112. Its totient is φ = 999998855110.

The previous prime is 999998855099. The next prime is 999998855159. The reversal of 999998855111 is 111558899999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999998855111 - 2¹⁰ = 999998854087 is a prime.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999998855171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999427555 + 499999427556.

It is an arithmetic number, because the mean of its divisors is an integer number (499999427556).

Almost surely, 2^999998855111 is an apocalyptic number.

999998855111 is a deficient number, since it is larger than the sum of its proper divisors (1).

999998855111 is an equidigital number, since it uses as much as digits as its factorization.

999998855111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94478400, while the sum is 74.

It can be divided in two parts, 9999 and 98855111, that multiplied together give a palindrome (988452254889).

The spelling of 999998855111 in words is "nine hundred ninety-nine billion, nine hundred ninety-eight million, eight hundred fifty-five thousand, one hundred eleven".