204578998913 has 2 divisors, whose sum is σ = 204578998914. Its totient is φ = 204578998912.

The previous prime is 204578998853. The next prime is 204578998961. The reversal of 204578998913 is 319899875402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193148823169 + 11430175744 = 439487^2 + 106912^2 .

It is a cyclic number.

It is not a de Polignac number, because 204578998913 - 2¹² = 204578994817 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 204578998913.

It is not a weakly prime, because it can be changed into another prime (204578997913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102289499456 + 102289499457.

It is an arithmetic number, because the mean of its divisors is an integer number (102289499457).

Almost surely, 2^204578998913 is an apocalyptic number.

It is an amenable number.

204578998913 is a deficient number, since it is larger than the sum of its proper divisors (1).

204578998913 is an equidigital number, since it uses as much as digits as its factorization.

204578998913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39191040, while the sum is 65.

The spelling of 204578998913 in words is "two hundred four billion, five hundred seventy-eight million, nine hundred ninety-eight thousand, nine hundred thirteen".