205240330155 has 16 divisors (see below), whose sum is σ = 375296603904. Its totient is φ = 93824150880.

The previous prime is 205240330153. The next prime is 205240330201. The reversal of 205240330155 is 551033042502.

It is not a de Polignac number, because 205240330155 - 2¹ = 205240330153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205240330153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 977334801 + ... + 977335010.

It is an arithmetic number, because the mean of its divisors is an integer number (23456037744).

Almost surely, 2^205240330155 is an apocalyptic number.

205240330155 is a deficient number, since it is larger than the sum of its proper divisors (170056273749).

205240330155 is a wasteful number, since it uses less digits than its factorization.

205240330155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1954669826.

The product of its (nonzero) digits is 18000, while the sum is 30.

Adding to 205240330155 its reverse (551033042502), we get a palindrome (756273372657).

The spelling of 205240330155 in words is "two hundred five billion, two hundred forty million, three hundred thirty thousand, one hundred fifty-five".