9998777513 has 2 divisors, whose sum is σ = 9998777514. Its totient is φ = 9998777512.

The previous prime is 9998777429. The next prime is 9998777521. The reversal of 9998777513 is 3157778999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9180130969 + 818646544 = 95813^2 + 28612^2 .

It is a cyclic number.

It is not a de Polignac number, because 9998777513 - 2²⁴ = 9982000297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9998777513.

It is not a weakly prime, because it can be changed into another prime (9998777813) 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, 4999388756 + 4999388757.

It is an arithmetic number, because the mean of its divisors is an integer number (4999388757).

Almost surely, 2^9998777513 is an apocalyptic number.

It is an amenable number.

9998777513 is a deficient number, since it is larger than the sum of its proper divisors (1).

9998777513 is an equidigital number, since it uses as much as digits as its factorization.

9998777513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30005640, while the sum is 65.

The square root of 9998777513 is about 99993.8873781793. The cubic root of 9998777513 is about 2154.3468941741.

The spelling of 9998777513 in words is "nine billion, nine hundred ninety-eight million, seven hundred seventy-seven thousand, five hundred thirteen".