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BaseRepresentation
bin11101000110101001010…
…01010000111111111111
310112121011201102102111000
432203110221100333333
5112340444444444444
62043221010301343
7132150634516020
oct16432451207777
93477151372430
10999999999999
11356108a259a0
12141981b87853
13733b8298840
1436586446c47
151b02b766469
hexe8d4a50fff

999999999999 has 256 divisors, whose sum is σ = 2063316971520. Its totient is φ = 461894400000.

The previous prime is 999999999989. The next prime is 1000000000039.

999999999999 is nontrivially palindromic in base 10.

It is a Cunningham number, because it is equal to 1012-1.

It is a trimorphic number since its cube, 999999999997000000000002999999999999, ends in 999999999999.

It is not a de Polignac number, because 999999999999 - 216 = 999999934463 is a prime.

It is a super-9 number, since 9×9999999999999 (a number of 109 digits) contains 999999999 as substring.

It is a nude number because it is divisible by every one of its digits.

999999999999 is a modest number, since divided by 9999999 gives 99999 as remainder.

999999999999 is a nontrivial repdigit in base 10.

It is a plaindrome in base 10.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 999999999999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999999999959) by changing a digit.

It is a Kaprekar number, because its square (999999999998000000000001) can be partitioned into two parts whose sum is 999999999999.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 100994949 + ... + 101004849.

It is an arithmetic number, because the mean of its divisors is an integer number (8059831920).

Almost surely, 2999999999999 is an apocalyptic number.

999999999999 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

999999999999 is an abundant number, since it is smaller than the sum of its proper divisors (1063316971521).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999999999999 is a wasteful number, since it uses less digits than its factorization.

999999999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10079 (or 10073 counting only the distinct ones).

The product of its digits is 282429536481, while the sum is 108.

The spelling of 999999999999 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".