19817585968 has 40 divisors (see below), whose sum is σ = 39165493248. Its totient is φ = 9712245312.

The previous prime is 19817585929. The next prime is 19817585969. The reversal of 19817585968 is 86958571891.

It is not an unprimeable number, because it can be changed into a prime (19817585969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109905 + ... + 227407.

Almost surely, 2^19817585968 is an apocalyptic number.

It is an amenable number.

19817585968 is a deficient number, since it is larger than the sum of its proper divisors (19347907280).

19817585968 is a wasteful number, since it uses less digits than its factorization.

19817585968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117721 (or 117715 counting only the distinct ones).

The product of its digits is 43545600, while the sum is 67.

The spelling of 19817585968 in words is "nineteen billion, eight hundred seventeen million, five hundred eighty-five thousand, nine hundred sixty-eight".