9967688639 has 2 divisors, whose sum is σ = 9967688640. Its totient is φ = 9967688638.

The previous prime is 9967688617. The next prime is 9967688671. The reversal of 9967688639 is 9368867699.

It is a weak prime.

It is an emirp because it is prime and its reverse (9368867699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9967688639 - 2⁸ = 9967688383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9967688609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4983844319 + 4983844320.

It is an arithmetic number, because the mean of its divisors is an integer number (4983844320).

Almost surely, 2^9967688639 is an apocalyptic number.

9967688639 is a deficient number, since it is larger than the sum of its proper divisors (1).

9967688639 is an equidigital number, since it uses as much as digits as its factorization.

9967688639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211631616, while the sum is 71.

The square root of 9967688639 is about 99838.3124807306. The cubic root of 9967688639 is about 2152.1117624334. Note that the first 3 decimals are identical.

The spelling of 9967688639 in words is "nine billion, nine hundred sixty-seven million, six hundred eighty-eight thousand, six hundred thirty-nine".