15849140561 has 2 divisors, whose sum is σ = 15849140562. Its totient is φ = 15849140560.

The previous prime is 15849140557. The next prime is 15849140591. The reversal of 15849140561 is 16504194851.

15849140561 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., 12294596161 + 3554544400 = 110881^2 + 59620^2 .

It is a cyclic number.

It is not a de Polignac number, because 15849140561 - 2² = 15849140557 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (15849140521) 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, 7924570280 + 7924570281.

It is an arithmetic number, because the mean of its divisors is an integer number (7924570281).

Almost surely, 2^15849140561 is an apocalyptic number.

It is an amenable number.

15849140561 is a deficient number, since it is larger than the sum of its proper divisors (1).

15849140561 is an equidigital number, since it uses as much as digits as its factorization.

15849140561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 44.

The spelling of 15849140561 in words is "fifteen billion, eight hundred forty-nine million, one hundred forty thousand, five hundred sixty-one".