205045155 has 96 divisors (see below), whose sum is σ = 429004800. Its totient is φ = 92643264.

The previous prime is 205045151. The next prime is 205045171. The reversal of 205045155 is 551540502.

205045155 is a `hidden beast` number, since 2 + 0 + 504 + 5 + 155 = 666.

It is not a de Polignac number, because 205045155 - 2² = 205045151 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (205045151) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 919374 + ... + 919596.

It is an arithmetic number, because the mean of its divisors is an integer number (4468800).

Almost surely, 2^205045155 is an apocalyptic number.

205045155 is an abundant number, since it is smaller than the sum of its proper divisors (223959645).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205045155 is a wasteful number, since it uses less digits than its factorization.

205045155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390 (or 377 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 205045155 is about 14319.3978574520. The cubic root of 205045155 is about 589.6801435865.

Adding to 205045155 its reverse (551540502), we get a palindrome (756585657).

The spelling of 205045155 in words is "two hundred five million, forty-five thousand, one hundred fifty-five".