205660493 has 2 divisors, whose sum is σ = 205660494. Its totient is φ = 205660492.

The previous prime is 205660487. The next prime is 205660531. The reversal of 205660493 is 394066502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103286569 + 102373924 = 10163^2 + 10118^2 .

It is a cyclic number.

It is not a de Polignac number, because 205660493 - 2²⁰ = 204611917 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205662493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102830246 + 102830247.

It is an arithmetic number, because the mean of its divisors is an integer number (102830247).

Almost surely, 2^205660493 is an apocalyptic number.

It is an amenable number.

205660493 is a deficient number, since it is larger than the sum of its proper divisors (1).

205660493 is an equidigital number, since it uses as much as digits as its factorization.

205660493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 205660493 is about 14340.8679304985. The cubic root of 205660493 is about 590.2694287971.

The spelling of 205660493 in words is "two hundred five million, six hundred sixty thousand, four hundred ninety-three".