9988118779 has 2 divisors, whose sum is σ = 9988118780. Its totient is φ = 9988118778.

The previous prime is 9988118771. The next prime is 9988118813. The reversal of 9988118779 is 9778118899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9988118779 - 2³ = 9988118771 is a prime.

It is not a weakly prime, because it can be changed into another prime (9988118771) 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 as a sum of consecutive naturals, namely, 4994059389 + 4994059390.

It is an arithmetic number, because the mean of its divisors is an integer number (4994059390).

Almost surely, 2^9988118779 is an apocalyptic number.

9988118779 is a deficient number, since it is larger than the sum of its proper divisors (1).

9988118779 is an equidigital number, since it uses as much as digits as its factorization.

9988118779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18289152, while the sum is 67.

The square root of 9988118779 is about 99940.5762390832. The cubic root of 9988118779 is about 2153.5811080666.

The spelling of 9988118779 in words is "nine billion, nine hundred eighty-eight million, one hundred eighteen thousand, seven hundred seventy-nine".