9988664243 has 2 divisors, whose sum is σ = 9988664244. Its totient is φ = 9988664242.

The previous prime is 9988664233. The next prime is 9988664261. The reversal of 9988664243 is 3424668899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9988664243 - 2⁸ = 9988663987 is a prime.

It is not a weakly prime, because it can be changed into another prime (9988664233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4994332121 + 4994332122.

It is an arithmetic number, because the mean of its divisors is an integer number (4994332122).

Almost surely, 2^9988664243 is an apocalyptic number.

9988664243 is a deficient number, since it is larger than the sum of its proper divisors (1).

9988664243 is an equidigital number, since it uses as much as digits as its factorization.

9988664243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17915904, while the sum is 59.

The square root of 9988664243 is about 99943.3051434662. The cubic root of 9988664243 is about 2153.6203106301.

The spelling of 9988664243 in words is "nine billion, nine hundred eighty-eight million, six hundred sixty-four thousand, two hundred forty-three".