206408408429 has 2 divisors, whose sum is σ = 206408408430. Its totient is φ = 206408408428.

The previous prime is 206408408399. The next prime is 206408408431. The reversal of 206408408429 is 924804804602.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202295751529 + 4112656900 = 449773^2 + 64130^2 .

It is a cyclic number.

It is not a de Polignac number, because 206408408429 - 2²⁰ = 206407359853 is a prime.

Together with 206408408431, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206408408629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103204204214 + 103204204215.

It is an arithmetic number, because the mean of its divisors is an integer number (103204204215).

Almost surely, 2^206408408429 is an apocalyptic number.

It is an amenable number.

206408408429 is a deficient number, since it is larger than the sum of its proper divisors (1).

206408408429 is an equidigital number, since it uses as much as digits as its factorization.

206408408429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 884736, while the sum is 47.

The spelling of 206408408429 in words is "two hundred six billion, four hundred eight million, four hundred eight thousand, four hundred twenty-nine".