999998555211111 has 32 divisors (see below), whose sum is σ = 1473164558069760. Its totient is φ = 600161118441984.

The previous prime is 999998555211031. The next prime is 999998555211119. The reversal of 999998555211111 is 111112555899999.

It is not a de Polignac number, because 999998555211111 - 2¹¹ = 999998555209063 is a prime.

It is a super-2 number, since 2×999998555211111² (a number of 31 digits) contains 22 as substring.

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 (999998555211119) 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, 77127201 + ... + 89154933.

It is an arithmetic number, because the mean of its divisors is an integer number (46036392439680).

Almost surely, 2^{999998555211111} is an apocalyptic number.

999998555211111 is a deficient number, since it is larger than the sum of its proper divisors (473166002858649).

999998555211111 is a wasteful number, since it uses less digits than its factorization.

999998555211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12098655.

The product of its digits is 118098000, while the sum is 75.

The spelling of 999998555211111 in words is "nine hundred ninety-nine trillion, nine hundred ninety-eight billion, five hundred fifty-five million, two hundred eleven thousand, one hundred eleven".