205134825647417 has 4 divisors (see below), whose sum is σ = 205174358284260. Its totient is φ = 205095293010576.

The previous prime is 205134825647393. The next prime is 205134825647447. The reversal of 205134825647417 is 714746528431502.

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 55853859919936 + 149280965727481 = 7473544^2 + 12218059^2 .

It is a cyclic number.

It is not a de Polignac number, because 205134825647417 - 2²⁰ = 205134824598841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205134825647447) 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, 19766310638 + ... + 19766321015.

It is an arithmetic number, because the mean of its divisors is an integer number (51293589571065).

Almost surely, 2^{205134825647417} is an apocalyptic number.

It is an amenable number.

205134825647417 is a deficient number, since it is larger than the sum of its proper divisors (39532636843).

205134825647417 is an equidigital number, since it uses as much as digits as its factorization.

205134825647417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39532636842.

The product of its (nonzero) digits is 45158400, while the sum is 59.

The spelling of 205134825647417 in words is "two hundred five trillion, one hundred thirty-four billion, eight hundred twenty-five million, six hundred forty-seven thousand, four hundred seventeen".