204020566242139 has 2 divisors, whose sum is σ = 204020566242140. Its totient is φ = 204020566242138.

The previous prime is 204020566241939. The next prime is 204020566242161. The reversal of 204020566242139 is 931242665020402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204020566242139 - 2¹¹ = 204020566240091 is a prime.

It is not a weakly prime, because it can be changed into another prime (204020506242139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102010283121069 + 102010283121070.

It is an arithmetic number, because the mean of its divisors is an integer number (102010283121070).

Almost surely, 2^{204020566242139} is an apocalyptic number.

204020566242139 is a deficient number, since it is larger than the sum of its proper divisors (1).

204020566242139 is an equidigital number, since it uses as much as digits as its factorization.

204020566242139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 46.

The spelling of 204020566242139 in words is "two hundred four trillion, twenty billion, five hundred sixty-six million, two hundred forty-two thousand, one hundred thirty-nine".