999938005811 has 2 divisors, whose sum is σ = 999938005812. Its totient is φ = 999938005810.

The previous prime is 999938005783. The next prime is 999938005819. The reversal of 999938005811 is 118500839999.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999938005811 is a prime.

It is not a weakly prime, because it can be changed into another prime (999938005819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499969002905 + 499969002906.

It is an arithmetic number, because the mean of its divisors is an integer number (499969002906).

Almost surely, 2^999938005811 is an apocalyptic number.

999938005811 is a deficient number, since it is larger than the sum of its proper divisors (1).

999938005811 is an equidigital number, since it uses as much as digits as its factorization.

999938005811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6298560, while the sum is 62.

The spelling of 999938005811 in words is "nine hundred ninety-nine billion, nine hundred thirty-eight million, five thousand, eight hundred eleven".