205241617297 has 4 divisors (see below), whose sum is σ = 208606234036. Its totient is φ = 201877000560.

The previous prime is 205241617267. The next prime is 205241617309. The reversal of 205241617297 is 792716142502.

It is a Cunningham number, because it is equal to 453036²+1.

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 6674236416 + 198567380881 = 81696^2 + 445609^2 .

It is a cyclic number.

It is not a de Polignac number, because 205241617297 - 2⁷ = 205241617169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205241617267) 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, 1682308278 + ... + 1682308399.

It is an arithmetic number, because the mean of its divisors is an integer number (52151558509).

Almost surely, 2^205241617297 is an apocalyptic number.

It is an amenable number.

205241617297 is a deficient number, since it is larger than the sum of its proper divisors (3364616739).

205241617297 is an equidigital number, since it uses as much as digits as its factorization.

205241617297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3364616738.

The product of its (nonzero) digits is 423360, while the sum is 46.

Adding to 205241617297 its reverse (792716142502), we get a palindrome (997957759799).

The spelling of 205241617297 in words is "two hundred five billion, two hundred forty-one million, six hundred seventeen thousand, two hundred ninety-seven".