204740269649 has 4 divisors (see below), whose sum is σ = 204987243060. Its totient is φ = 204493296240.

The previous prime is 204740269621. The next prime is 204740269661. The reversal of 204740269649 is 946962047402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 137986246225 + 66754023424 = 371465^2 + 258368^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204740269649 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204740269649.

It is not an unprimeable number, because it can be changed into a prime (204740259649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123485462 + ... + 123487119.

It is an arithmetic number, because the mean of its divisors is an integer number (51246810765).

Almost surely, 2^204740269649 is an apocalyptic number.

It is an amenable number.

204740269649 is a deficient number, since it is larger than the sum of its proper divisors (246973411).

204740269649 is an equidigital number, since it uses as much as digits as its factorization.

204740269649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246973410.

The product of its (nonzero) digits is 5225472, while the sum is 53.

The spelling of 204740269649 in words is "two hundred four billion, seven hundred forty million, two hundred sixty-nine thousand, six hundred forty-nine".