561605505667 has 2 divisors, whose sum is σ = 561605505668. Its totient is φ = 561605505666.

The previous prime is 561605505653. The next prime is 561605505689. The reversal of 561605505667 is 766505506165.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561605505667 is a prime.

It is a super-2 number, since 2×561605505667² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (561605505647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280802752833 + 280802752834.

It is an arithmetic number, because the mean of its divisors is an integer number (280802752834).

Almost surely, 2^561605505667 is an apocalyptic number.

561605505667 is a deficient number, since it is larger than the sum of its proper divisors (1).

561605505667 is an equidigital number, since it uses as much as digits as its factorization.

561605505667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5670000, while the sum is 52.

The spelling of 561605505667 in words is "five hundred sixty-one billion, six hundred five million, five hundred five thousand, six hundred sixty-seven".