205516085 has 4 divisors (see below), whose sum is σ = 246619308. Its totient is φ = 164412864.

The previous prime is 205516079. The next prime is 205516123. The reversal of 205516085 is 580615502.

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 98227921 + 107288164 = 9911^2 + 10358^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205516085 is a prime.

It is a super-2 number, since 2×205516085² = 84473722387454450, which contains 22 as substring.

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, 20551604 + ... + 20551613.

It is an arithmetic number, because the mean of its divisors is an integer number (61654827).

Almost surely, 2^205516085 is an apocalyptic number.

It is an amenable number.

205516085 is a deficient number, since it is larger than the sum of its proper divisors (41103223).

205516085 is an equidigital number, since it uses as much as digits as its factorization.

205516085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41103222.

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 205516085 is about 14335.8322046542. The cubic root of 205516085 is about 590.1312405545.

The spelling of 205516085 in words is "two hundred five million, five hundred sixteen thousand, eighty-five".