206327243170557 has 12 divisors (see below), whose sum is σ = 298028389118460. Its totient is φ = 137551426685568.

The previous prime is 206327243170463. The next prime is 206327243170589. The reversal of 206327243170557 is 755071342723602.

It is a happy number.

206327243170557 is a `hidden beast` number, since 2 + 0 + 6 + 3 + 2 + 72 + 4 + 3 + 17 + 0 + 557 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 152371842522201 + 53955400648356 = 12343899^2 + 7345434^2 .

It is not a de Polignac number, because 206327243170557 - 2¹⁹ = 206327242646269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206327243170597) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18801319 + ... + 27679307.

It is an arithmetic number, because the mean of its divisors is an integer number (24835699093205).

Almost surely, 2^{206327243170557} is an apocalyptic number.

It is an amenable number.

206327243170557 is a deficient number, since it is larger than the sum of its proper divisors (91701145947903).

206327243170557 is a wasteful number, since it uses less digits than its factorization.

206327243170557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11460252 (or 11460249 counting only the distinct ones).

The product of its (nonzero) digits is 14817600, while the sum is 54.

The spelling of 206327243170557 in words is "two hundred six trillion, three hundred twenty-seven billion, two hundred forty-three million, one hundred seventy thousand, five hundred fifty-seven".