999988654221111 has 8 divisors (see below), whose sum is σ = 1333443670825984. Its totient is φ = 666596370215160.

The previous prime is 999988654221083. The next prime is 999988654221169. The reversal of 999988654221111 is 111122456889999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 999988654221111 - 2¹⁷ = 999988654090039 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999988654220111) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15683112535 + ... + 15683176296.

It is an arithmetic number, because the mean of its divisors is an integer number (166680458853248).

Almost surely, 2^{999988654221111} is an apocalyptic number.

999988654221111 is a deficient number, since it is larger than the sum of its proper divisors (333455016604873).

999988654221111 is a wasteful number, since it uses less digits than its factorization.

999988654221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31366299461.

The product of its digits is 201553920, while the sum is 75.

The spelling of 999988654221111 in words is "nine hundred ninety-nine trillion, nine hundred eighty-eight billion, six hundred fifty-four million, two hundred twenty-one thousand, one hundred eleven".