56556641563 has 2 divisors, whose sum is σ = 56556641564. Its totient is φ = 56556641562.

The previous prime is 56556641527. The next prime is 56556641567. The reversal of 56556641563 is 36514665565.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56556641563 is a prime.

It is a super-3 number, since 3×56556641563³ (a number of 33 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 56556641563.

It is not a weakly prime, because it can be changed into another prime (56556641567) 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, 28278320781 + 28278320782.

It is an arithmetic number, because the mean of its divisors is an integer number (28278320782).

Almost surely, 2^56556641563 is an apocalyptic number.

56556641563 is a deficient number, since it is larger than the sum of its proper divisors (1).

56556641563 is an equidigital number, since it uses as much as digits as its factorization.

56556641563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720000, while the sum is 52.

The spelling of 56556641563 in words is "fifty-six billion, five hundred fifty-six million, six hundred forty-one thousand, five hundred sixty-three".