16555564541 has 2 divisors, whose sum is σ = 16555564542. Its totient is φ = 16555564540.

The previous prime is 16555564507. The next prime is 16555564583. The reversal of 16555564541 is 14546555561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11787662041 + 4767902500 = 108571^2 + 69050^2 .

It is an emirp because it is prime and its reverse (14546555561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16555564541 - 2¹⁰ = 16555563517 is a prime.

It is a super-3 number, since 3×16555564541³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16555564141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8277782270 + 8277782271.

It is an arithmetic number, because the mean of its divisors is an integer number (8277782271).

Almost surely, 2^16555564541 is an apocalyptic number.

It is an amenable number.

16555564541 is a deficient number, since it is larger than the sum of its proper divisors (1).

16555564541 is an equidigital number, since it uses as much as digits as its factorization.

16555564541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800000, while the sum is 47.

The spelling of 16555564541 in words is "sixteen billion, five hundred fifty-five million, five hundred sixty-four thousand, five hundred forty-one".