19838731799997 has 72 divisors (see below), whose sum is σ = 32452620238584. Its totient is φ = 11662409088000.

The previous prime is 19838731799989. The next prime is 19838731800011. The reversal of 19838731799997 is 79999713783891.

It is a happy number.

19838731799997 is a `hidden beast` number, since 1 + 98 + 38 + 7 + 317 + 9 + 99 + 97 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7187862878361 + 12650868921636 = 2681019^2 + 3556806^2 .

It is not a de Polignac number, because 19838731799997 - 2³ = 19838731799989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19838731799927) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 6440097 + ... + 9008457.

It is an arithmetic number, because the mean of its divisors is an integer number (450730836647).

Almost surely, 2^{19838731799997} is an apocalyptic number.

It is an amenable number.

19838731799997 is a deficient number, since it is larger than the sum of its proper divisors (12613888438587).

19838731799997 is a wasteful number, since it uses less digits than its factorization.

19838731799997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2568603 (or 2568589 counting only the distinct ones).

The product of its digits is 11666192832, while the sum is 90.

The spelling of 19838731799997 in words is "nineteen trillion, eight hundred thirty-eight billion, seven hundred thirty-one million, seven hundred ninety-nine thousand, nine hundred ninety-seven".