19981139573788 has 24 divisors (see below), whose sum is σ = 35138110709520. Its totient is φ = 9941730760320.

The previous prime is 19981139573779. The next prime is 19981139573867. The reversal of 19981139573788 is 88737593118991.

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, 4867198 + ... + 7978213.

It is an arithmetic number, because the mean of its divisors is an integer number (1464087946230).

Almost surely, 2^{19981139573788} is an apocalyptic number.

It is an amenable number.

19981139573788 is a deficient number, since it is larger than the sum of its proper divisors (15156971135732).

19981139573788 is a wasteful number, since it uses less digits than its factorization.

19981139573788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12847317 (or 12847315 counting only the distinct ones).

The product of its digits is 823011840, while the sum is 79.

The spelling of 19981139573788 in words is "nineteen trillion, nine hundred eighty-one billion, one hundred thirty-nine million, five hundred seventy-three thousand, seven hundred eighty-eight".