208991608336 has 135 divisors (see below), whose sum is σ = 488701386381. Its totient is φ = 86325681792.

The previous prime is 208991608321. The next prime is 208991608349. The reversal of 208991608336 is 633806199802.

The square root of 208991608336 is 457156.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 109590129936 + 99401478400 = 331044^2 + 315280^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 371210391 + ... + 371210953.

Almost surely, 2^208991608336 is an apocalyptic number.

208991608336 is the 457156-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 208991608336

208991608336 is an abundant number, since it is smaller than the sum of its proper divisors (279709778045).

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

208991608336 is an frugal number, since it uses more digits than its factorization.

208991608336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206 (or 601 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 55.

The spelling of 208991608336 in words is "two hundred eight billion, nine hundred ninety-one million, six hundred eight thousand, three hundred thirty-six".