19998201981804 has 24 divisors (see below), whose sum is σ = 46667415137280. Its totient is φ = 6665361063504.

The previous prime is 19998201981763. The next prime is 19998201981869. The reversal of 19998201981804 is 40818910289991.

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, 88164984 + ... + 88391519.

It is an arithmetic number, because the mean of its divisors is an integer number (1944475630720).

Almost surely, 2^{19998201981804} is an apocalyptic number.

It is an amenable number.

19998201981804 is an abundant number, since it is smaller than the sum of its proper divisors (26669213155476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19998201981804 is a wasteful number, since it uses less digits than its factorization.

19998201981804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176565949 (or 176565947 counting only the distinct ones).

The product of its (nonzero) digits is 26873856, while the sum is 69.

The spelling of 19998201981804 in words is "nineteen trillion, nine hundred ninety-eight billion, two hundred one million, nine hundred eighty-one thousand, eight hundred four".