7999999999999 has 16 divisors (see below), whose sum is σ = 9441092141056. Its totient is φ = 6633621489600.

The previous prime is 7999999999993. The next prime is 8000000000009. The reversal of 7999999999999 is 9999999999997.

It is a Cunningham number, because it is equal to 20000³-1.

It is not a de Polignac number, because 7999999999999 - 2³ = 7999999999991 is a prime.

It is a super-9 number, since 9×7999999999999⁹ (a number of 118 digits) contains 999999999 as substring.

It is a Duffinian number.

7999999999999 is a modest number, since divided by 9999999 gives 799999 as remainder.

It is a plaindrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 7999999999892 and 7999999999901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7999999999991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5831967 + ... + 7071904.

It is an arithmetic number, because the mean of its divisors is an integer number (590068258816).

Almost surely, 2^{7999999999999} is an apocalyptic number.

7999999999999 is a deficient number, since it is larger than the sum of its proper divisors (1441092141057).

7999999999999 is a wasteful number, since it uses less digits than its factorization.

7999999999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12906766.

The product of its digits is 1977006755367, while the sum is 115.

It can be divided in two parts, 799999999999 and 9, that added together give a palindrome (800000000008).

The spelling of 7999999999999 in words is "seven trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".