205512330116605 has 4 divisors (see below), whose sum is σ = 246614796139932. Its totient is φ = 164409864093280.

The previous prime is 205512330116579. The next prime is 205512330116627. The reversal of 205512330116605 is 506611033215502.

It is a happy number.

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 83485024836196 + 122027305280409 = 9137014^2 + 11046597^2 .

It is not a de Polignac number, because 205512330116605 - 2⁵ = 205512330116573 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20551233011656 + ... + 20551233011665.

It is an arithmetic number, because the mean of its divisors is an integer number (61653699034983).

Almost surely, 2^{205512330116605} is an apocalyptic number.

It is an amenable number.

205512330116605 is a deficient number, since it is larger than the sum of its proper divisors (41102466023327).

205512330116605 is an equidigital number, since it uses as much as digits as its factorization.

205512330116605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41102466023326.

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 205512330116605 in words is "two hundred five trillion, five hundred twelve billion, three hundred thirty million, one hundred sixteen thousand, six hundred five".