208666047077 has 2 divisors, whose sum is σ = 208666047078. Its totient is φ = 208666047076.

The previous prime is 208666047053. The next prime is 208666047097. The reversal of 208666047077 is 770740666802.

208666047077 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208069173316 + 596873761 = 456146^2 + 24431^2 .

It is a cyclic number.

It is not a de Polignac number, because 208666047077 - 2⁸ = 208666046821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208666047097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104333023538 + 104333023539.

It is an arithmetic number, because the mean of its divisors is an integer number (104333023539).

Almost surely, 2^208666047077 is an apocalyptic number.

It is an amenable number.

208666047077 is a deficient number, since it is larger than the sum of its proper divisors (1).

208666047077 is an equidigital number, since it uses as much as digits as its factorization.

208666047077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4741632, while the sum is 53.

The spelling of 208666047077 in words is "two hundred eight billion, six hundred sixty-six million, forty-seven thousand, seventy-seven".