19898355842128 has 40 divisors (see below), whose sum is σ = 38831828666400. Its totient is φ = 9877243945344.

The previous prime is 19898355842119. The next prime is 19898355842179. The reversal of 19898355842128 is 82124855389891.

It is a Smith number, since the sum of its digits (73) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67772250 + ... + 68065222.

It is an arithmetic number, because the mean of its divisors is an integer number (970795716660).

Almost surely, 2^{19898355842128} is an apocalyptic number.

It is an amenable number.

19898355842128 is a deficient number, since it is larger than the sum of its proper divisors (18933472824272).

19898355842128 is a wasteful number, since it uses less digits than its factorization.

19898355842128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323659 (or 323653 counting only the distinct ones).

The product of its digits is 398131200, while the sum is 73.

The spelling of 19898355842128 in words is "nineteen trillion, eight hundred ninety-eight billion, three hundred fifty-five million, eight hundred forty-two thousand, one hundred twenty-eight".