204815061309 has 16 divisors (see below), whose sum is σ = 283467744000. Its totient is φ = 131385016896.

The previous prime is 204815061287. The next prime is 204815061313. The reversal of 204815061309 is 903160518402.

It is not a de Polignac number, because 204815061309 - 2¹⁷ = 204814930237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204815061109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3991909 + ... + 4042890.

It is an arithmetic number, because the mean of its divisors is an integer number (17716734000).

Almost surely, 2^204815061309 is an apocalyptic number.

204815061309 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

204815061309 is a deficient number, since it is larger than the sum of its proper divisors (78652682691).

204815061309 is a wasteful number, since it uses less digits than its factorization.

204815061309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8035124.

The product of its (nonzero) digits is 51840, while the sum is 39.

The spelling of 204815061309 in words is "two hundred four billion, eight hundred fifteen million, sixty-one thousand, three hundred nine".