201998879942161 has 3 divisors (see below), whose sum is σ = 201998894154793. Its totient is φ = 201998865729530.

The previous prime is 201998879942141. The next prime is 201998879942179. The reversal of 201998879942161 is 161249978899102.

The square root of 201998879942161 is 14212631.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 201998879942161 - 2¹⁷ = 201998879811089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201998879942141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7106316 + ... + 21318946.

Almost surely, 2^{201998879942161} is an apocalyptic number.

201998879942161 is the 14212631-st square number.

201998879942161 is the 7106316-th centered octagonal number.

It is an amenable number.

201998879942161 is a deficient number, since it is larger than the sum of its proper divisors (14212632).

201998879942161 is an frugal number, since it uses more digits than its factorization.

201998879942161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28425262 (or 14212631 counting only the distinct ones).

The product of its (nonzero) digits is 282175488, while the sum is 76.

The spelling of 201998879942161 in words is "two hundred one trillion, nine hundred ninety-eight billion, eight hundred seventy-nine million, nine hundred forty-two thousand, one hundred sixty-one".