9998779613 has 2 divisors, whose sum is σ = 9998779614. Its totient is φ = 9998779612.

The previous prime is 9998779541. The next prime is 9998779631. The reversal of 9998779613 is 3169778999.

Together with next prime (9998779631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9756105529 + 242674084 = 98773^2 + 15578^2 .

It is an emirp because it is prime and its reverse (3169778999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9998779613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9998779643) 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, 4999389806 + 4999389807.

It is an arithmetic number, because the mean of its divisors is an integer number (4999389807).

Almost surely, 2^9998779613 is an apocalyptic number.

It is an amenable number.

9998779613 is a deficient number, since it is larger than the sum of its proper divisors (1).

9998779613 is an equidigital number, since it uses as much as digits as its factorization.

9998779613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46294416, while the sum is 68.

The square root of 9998779613 is about 99993.8978788206. The cubic root of 9998779613 is about 2154.3470449968.

The spelling of 9998779613 in words is "nine billion, nine hundred ninety-eight million, seven hundred seventy-nine thousand, six hundred thirteen".