19611998559 has 24 divisors (see below), whose sum is σ = 29662901632. Its totient is φ = 12947710680.

The previous prime is 19611998557. The next prime is 19611998563. The reversal of 19611998559 is 95589911691.

19611998559 is a `hidden beast` number, since 1 + 9 + 61 + 19 + 9 + 8 + 559 = 666.

It is not a de Polignac number, because 19611998559 - 2¹ = 19611998557 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19611998496 and 19611998505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19611998557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 366757 + ... + 416814.

Almost surely, 2^19611998559 is an apocalyptic number.

19611998559 is a deficient number, since it is larger than the sum of its proper divisors (10050903073).

19611998559 is an equidigital number, since it uses as much as digits as its factorization.

19611998559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783689 (or 783677 counting only the distinct ones).

The product of its digits is 7873200, while the sum is 63.

The spelling of 19611998559 in words is "nineteen billion, six hundred eleven million, nine hundred ninety-eight thousand, five hundred fifty-nine".