208944977077 has 2 divisors, whose sum is σ = 208944977078. Its totient is φ = 208944977076.

The previous prime is 208944977063. The next prime is 208944977141. The reversal of 208944977077 is 770779449802.

It is an a-pointer prime, because the next prime (208944977141) can be obtained adding 208944977077 to its sum of digits (64).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198408775761 + 10536201316 = 445431^2 + 102646^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208944977077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208944977057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104472488538 + 104472488539.

It is an arithmetic number, because the mean of its divisors is an integer number (104472488539).

Almost surely, 2^208944977077 is an apocalyptic number.

It is an amenable number.

208944977077 is a deficient number, since it is larger than the sum of its proper divisors (1).

208944977077 is an equidigital number, since it uses as much as digits as its factorization.

208944977077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49787136, while the sum is 64.

The spelling of 208944977077 in words is "two hundred eight billion, nine hundred forty-four million, nine hundred seventy-seven thousand, seventy-seven".