999888555222111 has 32 divisors (see below), whose sum is σ = 1387103243516928. Its totient is φ = 640119490992000.

The previous prime is 999888555222023. The next prime is 999888555222127. The reversal of 999888555222111 is 111222555888999.

It is not a de Polignac number, because 999888555222111 - 2⁴⁵ = 964704183133279 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 an unprimeable number, because it can be changed into a prime (999888555122111) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45243015 + ... + 63613736.

It is an arithmetic number, because the mean of its divisors is an integer number (43346976359904).

Almost surely, 2^{999888555222111} is an apocalyptic number.

999888555222111 is a deficient number, since it is larger than the sum of its proper divisors (387214688294817).

999888555222111 is a wasteful number, since it uses less digits than its factorization.

999888555222111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108857871.

The product of its digits is 373248000, while the sum is 75.

The spelling of 999888555222111 in words is "nine hundred ninety-nine trillion, eight hundred eighty-eight billion, five hundred fifty-five million, two hundred twenty-two thousand, one hundred eleven".