816565417 has 2 divisors, whose sum is σ = 816565418. Its totient is φ = 816565416.

The previous prime is 816565411. The next prime is 816565427. The reversal of 816565417 is 714565618.

816565417 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 600446016 + 216119401 = 24504^2 + 14701^2 .

It is a cyclic number.

It is not a de Polignac number, because 816565417 - 2¹¹ = 816563369 is a prime.

It is not a weakly prime, because it can be changed into another prime (816565411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408282708 + 408282709.

It is an arithmetic number, because the mean of its divisors is an integer number (408282709).

Almost surely, 2^816565417 is an apocalyptic number.

It is an amenable number.

816565417 is a deficient number, since it is larger than the sum of its proper divisors (1).

816565417 is an equidigital number, since it uses as much as digits as its factorization.

816565417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201600, while the sum is 43.

The square root of 816565417 is about 28575.6087774171. The cubic root of 816565417 is about 934.6815303234.

The spelling of 816565417 in words is "eight hundred sixteen million, five hundred sixty-five thousand, four hundred seventeen".