208128818534 has 32 divisors (see below), whose sum is σ = 385930573056. Its totient is φ = 81973942560.

The previous prime is 208128818533. The next prime is 208128818563. The reversal of 208128818534 is 435818821802.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208128818533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2477552 + ... + 2560179.

It is an arithmetic number, because the mean of its divisors is an integer number (12060330408).

Almost surely, 2^208128818534 is an apocalyptic number.

208128818534 is a deficient number, since it is larger than the sum of its proper divisors (177801754522).

208128818534 is a wasteful number, since it uses less digits than its factorization.

208128818534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5037980.

The product of its (nonzero) digits is 983040, while the sum is 50.

The spelling of 208128818534 in words is "two hundred eight billion, one hundred twenty-eight million, eight hundred eighteen thousand, five hundred thirty-four".