9979999799 has 32 divisors (see below), whose sum is σ = 12725890560. Its totient is φ = 7600694400.

The previous prime is 9979999649. The next prime is 9979999823.

9979999799 is nontrivially palindromic in base 10.

9979999799 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 9979999799 - 2²⁴ = 9963222583 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9979999799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9979999399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1093244 + ... + 1102334.

It is an arithmetic number, because the mean of its divisors is an integer number (397684080).

Almost surely, 2^9979999799 is an apocalyptic number.

9979999799 is a deficient number, since it is larger than the sum of its proper divisors (2745890761).

9979999799 is a wasteful number, since it uses less digits than its factorization.

9979999799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9431.

The product of its digits is 2109289329, while the sum is 86.

The square root of 9979999799 is about 99899.9489439309. The cubic root of 9979999799 is about 2152.9974271927.

The spelling of 9979999799 in words is "nine billion, nine hundred seventy-nine million, nine hundred ninety-nine thousand, seven hundred ninety-nine".