9799999999999 has 4 divisors (see below), whose sum is σ = 10690909090920. Its totient is φ = 8909090909080.

The previous prime is 9799999999877. The next prime is 9800000000009. The reversal of 9799999999999 is 9999999999979.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9799999999999 - 2²¹ = 9799997902847 is a prime.

It is a super-9 number, since 9×9799999999999⁹ (a number of 118 digits) contains 999999999 as substring.

It is a Duffinian number.

9799999999999 is a modest number, since divided by 9999999 gives 979999 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 9799999999892 and 9799999999901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9799999999199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 445454545444 + ... + 445454545465.

It is an arithmetic number, because the mean of its divisors is an integer number (2672727272730).

Almost surely, 2^{9799999999999} is an apocalyptic number.

9799999999999 is a deficient number, since it is larger than the sum of its proper divisors (890909090921).

9799999999999 is a wasteful number, since it uses less digits than its factorization.

9799999999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890909090920.

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

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

The spelling of 9799999999999 in words is "nine trillion, seven hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".