208673973889 has 6 divisors (see below), whose sum is σ = 220234859250. Its totient is φ = 197691132816.

The previous prime is 208673973877. The next prime is 208673973919. The reversal of 208673973889 is 988379376802.

It can be written as a sum of positive squares in only one way, i.e., 112842246400 + 95831727489 = 335920^2 + 309567^2 .

It is not a de Polignac number, because 208673973889 - 2⁹ = 208673973377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208673973839) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 289021764 + ... + 289022485.

It is an arithmetic number, because the mean of its divisors is an integer number (36705809875).

Almost surely, 2^208673973889 is an apocalyptic number.

It is an amenable number.

208673973889 is a deficient number, since it is larger than the sum of its proper divisors (11560885361).

208673973889 is an equidigital number, since it uses as much as digits as its factorization.

208673973889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578044287 (or 578044268 counting only the distinct ones).

The product of its (nonzero) digits is 219469824, while the sum is 70.

The spelling of 208673973889 in words is "two hundred eight billion, six hundred seventy-three million, nine hundred seventy-three thousand, eight hundred eighty-nine".