208471488769 has 2 divisors, whose sum is σ = 208471488770. Its totient is φ = 208471488768.

The previous prime is 208471488671. The next prime is 208471488773. The reversal of 208471488769 is 967884174802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 174650439744 + 33821049025 = 417912^2 + 183905^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208471488769 is a prime.

It is a super-2 number, since 2×208471488769² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 208471488769.

It is not a weakly prime, because it can be changed into another prime (208474488769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104235744384 + 104235744385.

It is an arithmetic number, because the mean of its divisors is an integer number (104235744385).

Almost surely, 2^208471488769 is an apocalyptic number.

It is an amenable number.

208471488769 is a deficient number, since it is larger than the sum of its proper divisors (1).

208471488769 is an equidigital number, since it uses as much as digits as its factorization.

208471488769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43352064, while the sum is 64.

The spelling of 208471488769 in words is "two hundred eight billion, four hundred seventy-one million, four hundred eighty-eight thousand, seven hundred sixty-nine".