9979889799 has 32 divisors (see below), whose sum is σ = 15501219840. Its totient is φ = 5651452800.

The previous prime is 9979889749. The next prime is 9979889809.

9979889799 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 9979889799 - 2¹¹ = 9979887751 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9979889749) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 138532 + ... + 197865.

It is an arithmetic number, because the mean of its divisors is an integer number (484413120).

Almost surely, 2^9979889799 is an apocalyptic number.

9979889799 is a deficient number, since it is larger than the sum of its proper divisors (5521330041).

9979889799 is a wasteful number, since it uses less digits than its factorization.

9979889799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336471.

The product of its digits is 1666598976, while the sum is 84.

The square root of 9979889799 is about 99899.3983915819. The cubic root of 9979889799 is about 2152.9895170193.

The spelling of 9979889799 in words is "nine billion, nine hundred seventy-nine million, eight hundred eighty-nine thousand, seven hundred ninety-nine".