199697989796991 has 64 divisors (see below), whose sum is σ = 338706696268800. Its totient is φ = 113912842555008.

The previous prime is 199697989796939. The next prime is 199697989796999.

199697989796991 is a `hidden beast` number, since 199 + 6 + 97 + 98 + 97 + 9 + 69 + 91 = 666.

199697989796991 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 199697989796991 - 2³⁰ = 199696916055167 is a prime.

It is a congruent number.

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 63 ways as a sum of consecutive naturals, for example, 557295480 + ... + 557653698.

It is an arithmetic number, because the mean of its divisors is an integer number (5292292129200).

Almost surely, 2^{199697989796991} is an apocalyptic number.

199697989796991 is a deficient number, since it is larger than the sum of its proper divisors (139008706471809).

199697989796991 is a wasteful number, since it uses less digits than its factorization.

199697989796991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363405 (or 363399 counting only the distinct ones).

The product of its digits is 607475326752, while the sum is 108.

The spelling of 199697989796991 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-one".