206159239972097 has 4 divisors (see below), whose sum is σ = 207227422562820. Its totient is φ = 205091057381376.

The previous prime is 206159239972057. The next prime is 206159239972157. The reversal of 206159239972097 is 790279932951602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23528233049281 + 182631006922816 = 4850591^2 + 13514104^2 .

It is a cyclic number.

It is not a de Polignac number, because 206159239972097 - 2²⁶ = 206159172863233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 206159239972097.

It is not an unprimeable number, because it can be changed into a prime (206159239972057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 534091295072 + ... + 534091295457.

It is an arithmetic number, because the mean of its divisors is an integer number (51806855640705).

Almost surely, 2^{206159239972097} is an apocalyptic number.

It is an amenable number.

206159239972097 is a deficient number, since it is larger than the sum of its proper divisors (1068182590723).

206159239972097 is a wasteful number, since it uses less digits than its factorization.

206159239972097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068182590722.

The product of its (nonzero) digits is 231472080, while the sum is 71.

The spelling of 206159239972097 in words is "two hundred six trillion, one hundred fifty-nine billion, two hundred thirty-nine million, nine hundred seventy-two thousand, ninety-seven".