16555005563 has 2 divisors, whose sum is σ = 16555005564. Its totient is φ = 16555005562.

The previous prime is 16555005541. The next prime is 16555005587. The reversal of 16555005563 is 36550055561.

It is a weak prime.

It is an emirp because it is prime and its reverse (36550055561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16555005563 - 2⁸ = 16555005307 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16555005563.

It is not a weakly prime, because it can be changed into another prime (16555005763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8277502781 + 8277502782.

It is an arithmetic number, because the mean of its divisors is an integer number (8277502782).

Almost surely, 2^16555005563 is an apocalyptic number.

16555005563 is a deficient number, since it is larger than the sum of its proper divisors (1).

16555005563 is an equidigital number, since it uses as much as digits as its factorization.

16555005563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 337500, while the sum is 41.

The spelling of 16555005563 in words is "sixteen billion, five hundred fifty-five million, five thousand, five hundred sixty-three".