204412873073809 has 9 divisors (see below), whose sum is σ = 204594538536507. Its totient is φ = 204231368812224.

The previous prime is 204412873073803. The next prime is 204412873073867. The reversal of 204412873073809 is 908370378214402.

The square root of 204412873073809 is 14297303.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 83652114699409 + 120760758374400 = 9146153^2 + 10989120^2 .

It is not a de Polignac number, because 204412873073809 - 2²⁹ = 204412336202897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204412873073803) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 17857325724 + ... + 17857337170.

Almost surely, 2^{204412873073809} is an apocalyptic number.

204412873073809 is the 14297303-rd square number.

204412873073809 is the 7148652-nd centered octagonal number.

It is an amenable number.

204412873073809 is a deficient number, since it is larger than the sum of its proper divisors (181665462698).

204412873073809 is an frugal number, since it uses more digits than its factorization.

204412873073809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25392 (or 12696 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 58.

The spelling of 204412873073809 in words is "two hundred four trillion, four hundred twelve billion, eight hundred seventy-three million, seventy-three thousand, eight hundred nine".