15561066561071 has 2 divisors, whose sum is σ = 15561066561072. Its totient is φ = 15561066561070.

The previous prime is 15561066561067. The next prime is 15561066561091. The reversal of 15561066561071 is 17016566016551.

It is a weak prime.

It is an emirp because it is prime and its reverse (17016566016551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15561066561071 - 2² = 15561066561067 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15561066561041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7780533280535 + 7780533280536.

It is an arithmetic number, because the mean of its divisors is an integer number (7780533280536).

Almost surely, 2^{15561066561071} is an apocalyptic number.

15561066561071 is a deficient number, since it is larger than the sum of its proper divisors (1).

15561066561071 is an equidigital number, since it uses as much as digits as its factorization.

15561066561071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134000, while the sum is 50.

The spelling of 15561066561071 in words is "fifteen trillion, five hundred sixty-one billion, sixty-six million, five hundred sixty-one thousand, seventy-one".