9999799999 has 12 divisors (see below), whose sum is σ = 12138179184. Its totient is φ = 8198592864.

The previous prime is 9999799951. The next prime is 9999800003. The reversal of 9999799999 is 9999979999.

9999799999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9999799999 - 2¹³ = 9999791807 is a prime.

It is a Duffinian number.

9999799999 is a modest number, since divided by 99999 gives 99997 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999799399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4435342 + ... + 4437595.

It is an arithmetic number, because the mean of its divisors is an integer number (1011514932).

Almost surely, 2^9999799999 is an apocalyptic number.

9999799999 is a deficient number, since it is larger than the sum of its proper divisors (2138379185).

9999799999 is a wasteful number, since it uses less digits than its factorization.

9999799999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8872974 (or 8872967 counting only the distinct ones).

The product of its digits is 2711943423, while the sum is 88.

The square root of 9999799999 is about 99998.9999899999. Note that the first 4 decimals coincide. The cubic root of 9999799999 is about 2154.4203269664.

The spelling of 9999799999 in words is "nine billion, nine hundred ninety-nine million, seven hundred ninety-nine thousand, nine hundred ninety-nine".