19917285698 has 6 divisors (see below), whose sum is σ = 29876227929. Its totient is φ = 9958543056.

The previous prime is 19917285683. The next prime is 19917285727. The reversal of 19917285698 is 89658271991.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19800148369 + 117137329 = 140713^2 + 10823^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=99793.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 149690 + ... + 249482.

Almost surely, 2^19917285698 is an apocalyptic number.

19917285698 is a deficient number, since it is larger than the sum of its proper divisors (9958942231).

19917285698 is an frugal number, since it uses more digits than its factorization.

19917285698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199588 (or 99795 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 65.

The spelling of 19917285698 in words is "nineteen billion, nine hundred seventeen million, two hundred eighty-five thousand, six hundred ninety-eight".