204513197779393 has 2 divisors, whose sum is σ = 204513197779394. Its totient is φ = 204513197779392.

The previous prime is 204513197779351. The next prime is 204513197779427. The reversal of 204513197779393 is 393977791315402.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175594486956849 + 28918710822544 = 13251207^2 + 5377612^2 .

It is a cyclic number.

It is not a de Polignac number, because 204513197779393 - 2²¹ = 204513195682241 is a prime.

It is not a weakly prime, because it can be changed into another prime (204513197774393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102256598889696 + 102256598889697.

It is an arithmetic number, because the mean of its divisors is an integer number (102256598889697).

Almost surely, 2^{204513197779393} is an apocalyptic number.

It is an amenable number.

204513197779393 is a deficient number, since it is larger than the sum of its proper divisors (1).

204513197779393 is an equidigital number, since it uses as much as digits as its factorization.

204513197779393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270050760, while the sum is 70.

The spelling of 204513197779393 in words is "two hundred four trillion, five hundred thirteen billion, one hundred ninety-seven million, seven hundred seventy-nine thousand, three hundred ninety-three".