16563559423 has 2 divisors, whose sum is σ = 16563559424. Its totient is φ = 16563559422.

The previous prime is 16563559403. The next prime is 16563559477. The reversal of 16563559423 is 32495536561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16563559423 - 2¹⁷ = 16563428351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16563559403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8281779711 + 8281779712.

It is an arithmetic number, because the mean of its divisors is an integer number (8281779712).

Almost surely, 2^16563559423 is an apocalyptic number.

16563559423 is a deficient number, since it is larger than the sum of its proper divisors (1).

16563559423 is an equidigital number, since it uses as much as digits as its factorization.

16563559423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916000, while the sum is 49.

The spelling of 16563559423 in words is "sixteen billion, five hundred sixty-three million, five hundred fifty-nine thousand, four hundred twenty-three".