204115305261 has 16 divisors (see below), whose sum is σ = 311725584000. Its totient is φ = 116377540608.

The previous prime is 204115305253. The next prime is 204115305283. The reversal of 204115305261 is 162503511402.

204115305261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 204115305261 - 2³ = 204115305253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204115305061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10814376 + ... + 10833233.

It is an arithmetic number, because the mean of its divisors is an integer number (19482849000).

Almost surely, 2^204115305261 is an apocalyptic number.

204115305261 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

204115305261 is a deficient number, since it is larger than the sum of its proper divisors (107610278739).

204115305261 is a wasteful number, since it uses less digits than its factorization.

204115305261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21648068.

The product of its (nonzero) digits is 7200, while the sum is 30.

Adding to 204115305261 its reverse (162503511402), we get a palindrome (366618816663).

The spelling of 204115305261 in words is "two hundred four billion, one hundred fifteen million, three hundred five thousand, two hundred sixty-one".