204840129109 has 12 divisors (see below), whose sum is σ = 257319832672. Its totient is φ = 159615684360.

The previous prime is 204840129079. The next prime is 204840129121. The reversal of 204840129109 is 901921048402.

It is not a de Polignac number, because 204840129109 - 2²³ = 204831740501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204840129149) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120920127 + ... + 120921820.

Almost surely, 2^204840129109 is an apocalyptic number.

It is an amenable number.

204840129109 is a deficient number, since it is larger than the sum of its proper divisors (52479703563).

204840129109 is a wasteful number, since it uses less digits than its factorization.

204840129109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241841976 (or 241841965 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 40.

The spelling of 204840129109 in words is "two hundred four billion, eight hundred forty million, one hundred twenty-nine thousand, one hundred nine".