16000000561 has 2 divisors, whose sum is σ = 16000000562. Its totient is φ = 16000000560.

The previous prime is 16000000537. The next prime is 16000000607. The reversal of 16000000561 is 16500000061.

16000000561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14362584336 + 1637416225 = 119844^2 + 40465^2 .

It is a cyclic number.

It is not a de Polignac number, because 16000000561 - 2¹³ = 15999992369 is a prime.

It is not a weakly prime, because it can be changed into another prime (16000000361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8000000280 + 8000000281.

It is an arithmetic number, because the mean of its divisors is an integer number (8000000281).

Almost surely, 2^16000000561 is an apocalyptic number.

It is an amenable number.

16000000561 is a deficient number, since it is larger than the sum of its proper divisors (1).

16000000561 is an equidigital number, since it uses as much as digits as its factorization.

16000000561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 19.

The spelling of 16000000561 in words is "sixteen billion, five hundred sixty-one", and thus it is an aban number.