206766777859 has 2 divisors, whose sum is σ = 206766777860. Its totient is φ = 206766777858.

The previous prime is 206766777857. The next prime is 206766777887. The reversal of 206766777859 is 958777667602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 206766777859 - 2¹ = 206766777857 is a prime.

Together with 206766777857, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (206766777853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103383388929 + 103383388930.

It is an arithmetic number, because the mean of its divisors is an integer number (103383388930).

Almost surely, 2^206766777859 is an apocalyptic number.

206766777859 is a deficient number, since it is larger than the sum of its proper divisors (1).

206766777859 is an equidigital number, since it uses as much as digits as its factorization.

206766777859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373403520, while the sum is 70.

The spelling of 206766777859 in words is "two hundred six billion, seven hundred sixty-six million, seven hundred seventy-seven thousand, eight hundred fifty-nine".