206876463809 has 2 divisors, whose sum is σ = 206876463810. Its totient is φ = 206876463808.

The previous prime is 206876463791. The next prime is 206876463817. The reversal of 206876463809 is 908364678602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202885383184 + 3991080625 = 450428^2 + 63175^2 .

It is a cyclic number.

It is not a de Polignac number, because 206876463809 - 2²⁸ = 206608028353 is a prime.

It is not a weakly prime, because it can be changed into another prime (206876463839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103438231904 + 103438231905.

It is an arithmetic number, because the mean of its divisors is an integer number (103438231905).

Almost surely, 2^206876463809 is an apocalyptic number.

It is an amenable number.

206876463809 is a deficient number, since it is larger than the sum of its proper divisors (1).

206876463809 is an equidigital number, since it uses as much as digits as its factorization.

206876463809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20901888, while the sum is 59.

The spelling of 206876463809 in words is "two hundred six billion, eight hundred seventy-six million, four hundred sixty-three thousand, eight hundred nine".