9906820811 has 2 divisors, whose sum is σ = 9906820812. Its totient is φ = 9906820810.

The previous prime is 9906820793. The next prime is 9906820813. The reversal of 9906820811 is 1180286099.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9906820811 - 2⁶ = 9906820747 is a prime.

Together with 9906820813, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9906820813) 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, 4953410405 + 4953410406.

It is an arithmetic number, because the mean of its divisors is an integer number (4953410406).

Almost surely, 2^9906820811 is an apocalyptic number.

9906820811 is a deficient number, since it is larger than the sum of its proper divisors (1).

9906820811 is an equidigital number, since it uses as much as digits as its factorization.

9906820811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 9906820811 is about 99533.0136738560. The cubic root of 9906820811 is about 2147.7221818844.

The spelling of 9906820811 in words is "nine billion, nine hundred six million, eight hundred twenty thousand, eight hundred eleven".