208434608851 has 16 divisors (see below), whose sum is σ = 239376077824. Its totient is φ = 177786451584.

The previous prime is 208434608839. The next prime is 208434608927. The reversal of 208434608851 is 158806434802.

It is not a de Polignac number, because 208434608851 - 2⁵ = 208434608819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 208434608795 and 208434608804.

It is not an unprimeable number, because it can be changed into a prime (208434608821) 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, 1149286 + ... + 1318228.

It is an arithmetic number, because the mean of its divisors is an integer number (14961004864).

Almost surely, 2^208434608851 is an apocalyptic number.

208434608851 is a deficient number, since it is larger than the sum of its proper divisors (30941468973).

208434608851 is a wasteful number, since it uses less digits than its factorization.

208434608851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169810.

The product of its (nonzero) digits is 1474560, while the sum is 49.

The spelling of 208434608851 in words is "two hundred eight billion, four hundred thirty-four million, six hundred eight thousand, eight hundred fifty-one".