19608676561 has 2 divisors, whose sum is σ = 19608676562. Its totient is φ = 19608676560.

The previous prime is 19608676531. The next prime is 19608676579. The reversal of 19608676561 is 16567680691.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17746236225 + 1862440336 = 133215^2 + 43156^2 .

It is a cyclic number.

It is not a de Polignac number, because 19608676561 - 2⁹ = 19608676049 is a prime.

It is not a weakly prime, because it can be changed into another prime (19608676531) 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, 9804338280 + 9804338281.

It is an arithmetic number, because the mean of its divisors is an integer number (9804338281).

Almost surely, 2^19608676561 is an apocalyptic number.

It is an amenable number.

19608676561 is a deficient number, since it is larger than the sum of its proper divisors (1).

19608676561 is an equidigital number, since it uses as much as digits as its factorization.

19608676561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 19608676561 in words is "nineteen billion, six hundred eight million, six hundred seventy-six thousand, five hundred sixty-one".