11999999999999 has 12 divisors (see below), whose sum is σ = 13348999314168. Its totient is φ = 10777656069840.

The previous prime is 11999999999969. The next prime is 12000000000017. The reversal of 11999999999999 is 99999999999911.

It is not a de Polignac number, because 11999999999999 - 2¹⁶ = 11999999934463 is a prime.

It is a super-9 number, since 9×11999999999999⁹ (a number of 119 digits) contains 999999999 as substring.

It is a Duffinian number.

11999999999999 is a modest number, since divided by 9999999 gives 1199999 as remainder.

It is a plaindrome 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 11999999999999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11999999999969) by changing a digit.

Being equal to 12×10¹²-1, it is a generalized Woodall number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 597421004 + ... + 597441089.

It is an arithmetic number, because the mean of its divisors is an integer number (1112416609514).

Almost surely, 2^{11999999999999} is an apocalyptic number.

11999999999999 is a deficient number, since it is larger than the sum of its proper divisors (1348999314169).

11999999999999 is a wasteful number, since it uses less digits than its factorization.

11999999999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1194862198 (or 1194862187 counting only the distinct ones).

The product of its digits is 282429536481, while the sum is 110.

The spelling of 11999999999999 in words is "eleven trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".