9958713726809 has 2 divisors, whose sum is σ = 9958713726810. Its totient is φ = 9958713726808.

The previous prime is 9958713726803. The next prime is 9958713726817. The reversal of 9958713726809 is 9086273178599.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5861846265625 + 4096867461184 = 2421125^2 + 2024072^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9958713726809 is a prime.

It is not a weakly prime, because it can be changed into another prime (9958713726803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4979356863404 + 4979356863405.

It is an arithmetic number, because the mean of its divisors is an integer number (4979356863405).

Almost surely, 2^{9958713726809} is an apocalyptic number.

It is an amenable number.

9958713726809 is a deficient number, since it is larger than the sum of its proper divisors (1).

9958713726809 is an equidigital number, since it uses as much as digits as its factorization.

9958713726809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 411505920, while the sum is 74.

The spelling of 9958713726809 in words is "nine trillion, nine hundred fifty-eight billion, seven hundred thirteen million, seven hundred twenty-six thousand, eight hundred nine".