204905353405 has 8 divisors (see below), whose sum is σ = 246369504600. Its totient is φ = 163602229056.

The previous prime is 204905353399. The next prime is 204905353439. The reversal of 204905353405 is 504353509402.

It can be written as a sum of positive squares in 4 ways, for example, as 12378342564 + 192527010841 = 111258^2 + 438779^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 204905353405 - 2²⁷ = 204771135677 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 40253910 + ... + 40258999.

It is an arithmetic number, because the mean of its divisors is an integer number (30796188075).

Almost surely, 2^204905353405 is an apocalyptic number.

It is an amenable number.

204905353405 is a deficient number, since it is larger than the sum of its proper divisors (41464151195).

204905353405 is an equidigital number, since it uses as much as digits as its factorization.

204905353405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80513423.

The product of its (nonzero) digits is 324000, while the sum is 40.

The spelling of 204905353405 in words is "two hundred four billion, nine hundred five million, three hundred fifty-three thousand, four hundred five".