561666067 has 2 divisors, whose sum is σ = 561666068. Its totient is φ = 561666066.

The previous prime is 561666041. The next prime is 561666071. The reversal of 561666067 is 760666165.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561666067 is a prime.

It is not a weakly prime, because it can be changed into another prime (561666167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280833033 + 280833034.

It is an arithmetic number, because the mean of its divisors is an integer number (280833034).

Almost surely, 2^561666067 is an apocalyptic number.

561666067 is a deficient number, since it is larger than the sum of its proper divisors (1).

561666067 is an equidigital number, since it uses as much as digits as its factorization.

561666067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 43.

The square root of 561666067 is about 23699.4950790096. The cubic root of 561666067 is about 825.0736717803.

The spelling of 561666067 in words is "five hundred sixty-one million, six hundred sixty-six thousand, sixty-seven".