999555555555111 has 32 divisors (see below), whose sum is σ = 1370280357504000. Its totient is φ = 647640582600960.

The previous prime is 999555555555091. The next prime is 999555555555149. The reversal of 999555555555111 is 111555555555999.

It is not a de Polignac number, because 999555555555111 - 2²³ = 999555547166503 is a prime.

It is a super-2 number, since 2×999555555555111² (a number of 31 digits) contains 22 as substring.

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 (999555555555811) 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, 6617350315 + ... + 6617501363.

It is an arithmetic number, because the mean of its divisors is an integer number (42821261172000).

Almost surely, 2^{999555555555111} is an apocalyptic number.

999555555555111 is a deficient number, since it is larger than the sum of its proper divisors (370724801948889).

999555555555111 is a wasteful number, since it uses less digits than its factorization.

999555555555111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216879.

The product of its digits is 1423828125, while the sum is 75.

The spelling of 999555555555111 in words is "nine hundred ninety-nine trillion, five hundred fifty-five billion, five hundred fifty-five million, five hundred fifty-five thousand, one hundred eleven".