208509726468 has 12 divisors (see below), whose sum is σ = 486522695120. Its totient is φ = 69503242152.

The previous prime is 208509726427. The next prime is 208509726517. The reversal of 208509726468 is 864627905802.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8687905258 + ... + 8687905281.

Almost surely, 2^208509726468 is an apocalyptic number.

It is an amenable number.

208509726468 is an abundant number, since it is smaller than the sum of its proper divisors (278012968652).

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

208509726468 is a wasteful number, since it uses less digits than its factorization.

208509726468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17375810546 (or 17375810544 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 57.

The spelling of 208509726468 in words is "two hundred eight billion, five hundred nine million, seven hundred twenty-six thousand, four hundred sixty-eight".