561726806671 has 2 divisors, whose sum is σ = 561726806672. Its totient is φ = 561726806670.

The previous prime is 561726806659. The next prime is 561726806731. The reversal of 561726806671 is 176608627165.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561726806671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561726806621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280863403335 + 280863403336.

It is an arithmetic number, because the mean of its divisors is an integer number (280863403336).

Almost surely, 2^561726806671 is an apocalyptic number.

561726806671 is a deficient number, since it is larger than the sum of its proper divisors (1).

561726806671 is an equidigital number, since it uses as much as digits as its factorization.

561726806671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5080320, while the sum is 55.

The spelling of 561726806671 in words is "five hundred sixty-one billion, seven hundred twenty-six million, eight hundred six thousand, six hundred seventy-one".