206494663 has 2 divisors, whose sum is σ = 206494664. Its totient is φ = 206494662.

The previous prime is 206494657. The next prime is 206494697. The reversal of 206494663 is 366494602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 206494663 - 2²⁵ = 172940231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206494963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103247331 + 103247332.

It is an arithmetic number, because the mean of its divisors is an integer number (103247332).

Almost surely, 2^206494663 is an apocalyptic number.

206494663 is a deficient number, since it is larger than the sum of its proper divisors (1).

206494663 is an equidigital number, since it uses as much as digits as its factorization.

206494663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 40.

The square root of 206494663 is about 14369.9221640202. The cubic root of 206494663 is about 591.0664070676.

The spelling of 206494663 in words is "two hundred six million, four hundred ninety-four thousand, six hundred sixty-three".