206688899 has 2 divisors, whose sum is σ = 206688900. Its totient is φ = 206688898.

The previous prime is 206688877. The next prime is 206688953. The reversal of 206688899 is 998886602.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206688899 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (206688199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103344449 + 103344450.

It is an arithmetic number, because the mean of its divisors is an integer number (103344450).

Almost surely, 2^206688899 is an apocalyptic number.

206688899 is a deficient number, since it is larger than the sum of its proper divisors (1).

206688899 is an equidigital number, since it uses as much as digits as its factorization.

206688899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2985984, while the sum is 56.

The square root of 206688899 is about 14376.6789975989. The cubic root of 206688899 is about 591.2516748042.

The spelling of 206688899 in words is "two hundred six million, six hundred eighty-eight thousand, eight hundred ninety-nine".