206408408399 has 2 divisors, whose sum is σ = 206408408400. Its totient is φ = 206408408398.

The previous prime is 206408408389. The next prime is 206408408429. The reversal of 206408408399 is 993804804602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 206408408399 - 2⁴ = 206408408383 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206408408399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206408408389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103204204199 + 103204204200.

It is an arithmetic number, because the mean of its divisors is an integer number (103204204200).

Almost surely, 2^206408408399 is an apocalyptic number.

206408408399 is a deficient number, since it is larger than the sum of its proper divisors (1).

206408408399 is an equidigital number, since it uses as much as digits as its factorization.

206408408399 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 53.

The spelling of 206408408399 in words is "two hundred six billion, four hundred eight million, four hundred eight thousand, three hundred ninety-nine".