205533155 has 4 divisors (see below), whose sum is σ = 246639792. Its totient is φ = 164426520.

The previous prime is 205533109. The next prime is 205533161. The reversal of 205533155 is 551335502.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-205533155 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20553311 + ... + 20553320.

It is an arithmetic number, because the mean of its divisors is an integer number (61659948).

Almost surely, 2^205533155 is an apocalyptic number.

205533155 is a deficient number, since it is larger than the sum of its proper divisors (41106637).

205533155 is an equidigital number, since it uses as much as digits as its factorization.

205533155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41106636.

The product of its (nonzero) digits is 11250, while the sum is 29.

The square root of 205533155 is about 14336.4275536132. The cubic root of 205533155 is about 590.1475787102.

Adding to 205533155 its reverse (551335502), we get a palindrome (756868657).

The spelling of 205533155 in words is "two hundred five million, five hundred thirty-three thousand, one hundred fifty-five".