19434779569 has 2 divisors, whose sum is σ = 19434779570. Its totient is φ = 19434779568.

The previous prime is 19434779549. The next prime is 19434779633. The reversal of 19434779569 is 96597743491.

It is an a-pointer prime, because the next prime (19434779633) can be obtained adding 19434779569 to its sum of digits (64).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17072819569 + 2361960000 = 130663^2 + 48600^2 .

It is a cyclic number.

It is not a de Polignac number, because 19434779569 - 2⁹ = 19434779057 is a prime.

It is a super-2 number, since 2×19434779569² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19434779569.

It is not a weakly prime, because it can be changed into another prime (19434779549) 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, 9717389784 + 9717389785.

It is an arithmetic number, because the mean of its divisors is an integer number (9717389785).

Almost surely, 2^19434779569 is an apocalyptic number.

It is an amenable number.

19434779569 is a deficient number, since it is larger than the sum of its proper divisors (1).

19434779569 is an equidigital number, since it uses as much as digits as its factorization.

19434779569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51438240, while the sum is 64.

The spelling of 19434779569 in words is "nineteen billion, four hundred thirty-four million, seven hundred seventy-nine thousand, five hundred sixty-nine".