8555555563 has 2 divisors, whose sum is σ = 8555555564. Its totient is φ = 8555555562.

The previous prime is 8555555539. The next prime is 8555555579. The reversal of 8555555563 is 3655555558.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8555555563 - 2⁵ = 8555555531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8555555563.

It is not a weakly prime, because it can be changed into another prime (8555555363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4277777781 + 4277777782.

It is an arithmetic number, because the mean of its divisors is an integer number (4277777782).

Almost surely, 2^8555555563 is an apocalyptic number.

8555555563 is a deficient number, since it is larger than the sum of its proper divisors (1).

8555555563 is an equidigital number, since it uses as much as digits as its factorization.

8555555563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11250000, while the sum is 52.

The square root of 8555555563 is about 92496.2462103193. The cubic root of 8555555563 is about 2045.2641471472.

The spelling of 8555555563 in words is "eight billion, five hundred fifty-five million, five hundred fifty-five thousand, five hundred sixty-three".