204660666593 has 2 divisors, whose sum is σ = 204660666594. Its totient is φ = 204660666592.

The previous prime is 204660666559. The next prime is 204660666611. The reversal of 204660666593 is 395666066402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168860999329 + 35799667264 = 410927^2 + 189208^2 .

It is a cyclic number.

It is not a de Polignac number, because 204660666593 - 2¹² = 204660662497 is a prime.

It is a super-2 number, since 2×204660666593² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (204660666523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102330333296 + 102330333297.

It is an arithmetic number, because the mean of its divisors is an integer number (102330333297).

Almost surely, 2^204660666593 is an apocalyptic number.

It is an amenable number.

204660666593 is a deficient number, since it is larger than the sum of its proper divisors (1).

204660666593 is an equidigital number, since it uses as much as digits as its factorization.

204660666593 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8398080, while the sum is 53.

The spelling of 204660666593 in words is "two hundred four billion, six hundred sixty million, six hundred sixty-six thousand, five hundred ninety-three".