19566317041 has 2 divisors, whose sum is σ = 19566317042. Its totient is φ = 19566317040.

The previous prime is 19566317039. The next prime is 19566317083. The reversal of 19566317041 is 14071366591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19008412641 + 557904400 = 137871^2 + 23620^2 .

It is an emirp because it is prime and its reverse (14071366591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19566317041 - 2¹ = 19566317039 is a prime.

Together with 19566317039, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19566314041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9783158520 + 9783158521.

It is an arithmetic number, because the mean of its divisors is an integer number (9783158521).

Almost surely, 2^19566317041 is an apocalyptic number.

It is an amenable number.

19566317041 is a deficient number, since it is larger than the sum of its proper divisors (1).

19566317041 is an equidigital number, since it uses as much as digits as its factorization.

19566317041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 43.

The spelling of 19566317041 in words is "nineteen billion, five hundred sixty-six million, three hundred seventeen thousand, forty-one".