199697989796992 has 128 divisors (see below), whose sum is σ = 409452639805440. Its totient is φ = 96969227977728.

The previous prime is 199697989796939. The next prime is 199697989796999. The reversal of 199697989796992 is 299697989796991.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (199697989796999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 411618943 + ... + 412103809.

It is an arithmetic number, because the mean of its divisors is an integer number (3198848748480).

Almost surely, 2^{199697989796992} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199697989796992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204726319902720).

199697989796992 is an abundant number, since it is smaller than the sum of its proper divisors (209754650008448).

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

199697989796992 is a wasteful number, since it uses less digits than its factorization.

199697989796992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485458 (or 485446 counting only the distinct ones).

The product of its digits is 1214950653504, while the sum is 109.

Subtracting 199697989796992 from its reverse (299697989796991), we obtain a palindrome (99999999999999).

The spelling of 199697989796992 in words is "one hundred ninety-nine trillion, six hundred ninety-seven billion, nine hundred eighty-nine million, seven hundred ninety-six thousand, nine hundred ninety-two".