19475399561 has 2 divisors, whose sum is σ = 19475399562. Its totient is φ = 19475399560.

The previous prime is 19475399549. The next prime is 19475399579. The reversal of 19475399561 is 16599357491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9919164025 + 9556235536 = 99595^2 + 97756^2 .

It is a cyclic number.

It is not a de Polignac number, because 19475399561 - 2⁶ = 19475399497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19475399561.

It is not a weakly prime, because it can be changed into another prime (19475399861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9737699780 + 9737699781.

It is an arithmetic number, because the mean of its divisors is an integer number (9737699781).

Almost surely, 2^19475399561 is an apocalyptic number.

It is an amenable number.

19475399561 is a deficient number, since it is larger than the sum of its proper divisors (1).

19475399561 is an equidigital number, since it uses as much as digits as its factorization.

19475399561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9185400, while the sum is 59.

The spelling of 19475399561 in words is "nineteen billion, four hundred seventy-five million, three hundred ninety-nine thousand, five hundred sixty-one".