9988665939 has 24 divisors (see below), whose sum is σ = 16567396352. Its totient is φ = 5680750320.

The previous prime is 9988665923. The next prime is 9988665941. The reversal of 9988665939 is 9395668899.

It is not a de Polignac number, because 9988665939 - 2⁴ = 9988665923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9988665919) 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 23 ways as a sum of consecutive naturals, for example, 362419 + ... + 389004.

Almost surely, 2^9988665939 is an apocalyptic number.

9988665939 is a deficient number, since it is larger than the sum of its proper divisors (6578730413).

9988665939 is a wasteful number, since it uses less digits than its factorization.

9988665939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751647 (or 751644 counting only the distinct ones).

The product of its digits is 226748160, while the sum is 72.

The square root of 9988665939 is about 99943.3136282763. The cubic root of 9988665939 is about 2153.6204325196.

The spelling of 9988665939 in words is "nine billion, nine hundred eighty-eight million, six hundred sixty-five thousand, nine hundred thirty-nine".