204679771648 has 80 divisors (see below), whose sum is σ = 453700336320. Its totient is φ = 91459225600.

The previous prime is 204679771643. The next prime is 204679771691. The reversal of 204679771648 is 846177976402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204679771643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24303 + ... + 640273.

It is an arithmetic number, because the mean of its divisors is an integer number (5671254204).

Almost surely, 2^204679771648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204679771648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226850168160).

204679771648 is an abundant number, since it is smaller than the sum of its proper divisors (249020564672).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

204679771648 is an equidigital number, since it uses as much as digits as its factorization.

204679771648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616059 (or 616043 counting only the distinct ones).

The product of its (nonzero) digits is 28449792, while the sum is 61.

The spelling of 204679771648 in words is "two hundred four billion, six hundred seventy-nine million, seven hundred seventy-one thousand, six hundred forty-eight".