816564811 has 2 divisors, whose sum is σ = 816564812. Its totient is φ = 816564810.

The previous prime is 816564773. The next prime is 816564821. The reversal of 816564811 is 118465618.

816564811 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816564811 is a prime.

It is not a weakly prime, because it can be changed into another prime (816564821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408282405 + 408282406.

It is an arithmetic number, because the mean of its divisors is an integer number (408282406).

Almost surely, 2^816564811 is an apocalyptic number.

816564811 is a deficient number, since it is larger than the sum of its proper divisors (1).

816564811 is an equidigital number, since it uses as much as digits as its factorization.

816564811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46080, while the sum is 40.

The square root of 816564811 is about 28575.5981739665. The cubic root of 816564811 is about 934.6812991041.

The spelling of 816564811 in words is "eight hundred sixteen million, five hundred sixty-four thousand, eight hundred eleven".