9919506936809 has 2 divisors, whose sum is σ = 9919506936810. Its totient is φ = 9919506936808.

The previous prime is 9919506936751. The next prime is 9919506936817. The reversal of 9919506936809 is 9086396059199.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9751898576809 + 167608360000 = 3122803^2 + 409400^2 .

It is an emirp because it is prime and its reverse (9086396059199) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9919506936809 is a prime.

It is not a weakly prime, because it can be changed into another prime (9919506936709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4959753468404 + 4959753468405.

It is an arithmetic number, because the mean of its divisors is an integer number (4959753468405).

Almost surely, 2^{9919506936809} is an apocalyptic number.

It is an amenable number.

9919506936809 is a deficient number, since it is larger than the sum of its proper divisors (1).

9919506936809 is an equidigital number, since it uses as much as digits as its factorization.

9919506936809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 255091680, while the sum is 74.

The spelling of 9919506936809 in words is "nine trillion, nine hundred nineteen billion, five hundred six million, nine hundred thirty-six thousand, eight hundred nine".