205155433205 has 4 divisors (see below), whose sum is σ = 246186519852. Its totient is φ = 164124346560.

The previous prime is 205155433157. The next prime is 205155433261. The reversal of 205155433205 is 502334551502.

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 136550203729 + 68605229476 = 369527^2 + 261926^2 .

It is not a de Polignac number, because 205155433205 - 2³⁰ = 204081691381 is a prime.

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, 20515543316 + ... + 20515543325.

It is an arithmetic number, because the mean of its divisors is an integer number (61546629963).

Almost surely, 2^205155433205 is an apocalyptic number.

It is an amenable number.

205155433205 is a deficient number, since it is larger than the sum of its proper divisors (41031086647).

205155433205 is an equidigital number, since it uses as much as digits as its factorization.

205155433205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41031086646.

The product of its (nonzero) digits is 90000, while the sum is 35.

Adding to 205155433205 its reverse (502334551502), we get a palindrome (707489984707).

The spelling of 205155433205 in words is "two hundred five billion, one hundred fifty-five million, four hundred thirty-three thousand, two hundred five".