208434543858 has 18 divisors (see below), whose sum is σ = 451612375149. Its totient is φ = 69477535632.

The previous prime is 208434543841. The next prime is 208434543881. The reversal of 208434543858 is 858345434802.

208434543858 is a `hidden beast` number, since 2 + 0 + 8 + 43 + 4 + 543 + 8 + 58 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 110567555289 + 97866988569 = 332517^2 + 312837^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=322827.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1883158 + ... + 1990766.

Almost surely, 2^208434543858 is an apocalyptic number.

208434543858 is an abundant number, since it is smaller than the sum of its proper divisors (243177831291).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

208434543858 is an frugal number, since it uses more digits than its factorization.

208434543858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215226 (or 107614 counting only the distinct ones).

The product of its (nonzero) digits is 14745600, while the sum is 54.

The spelling of 208434543858 in words is "two hundred eight billion, four hundred thirty-four million, five hundred forty-three thousand, eight hundred fifty-eight".