209534069568 has 112 divisors (see below), whose sum is σ = 587186349120. Its totient is φ = 65715707904.

The previous prime is 209534069519. The next prime is 209534069593. The reversal of 209534069568 is 865960435902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13110030 + ... + 13126002.

It is an arithmetic number, because the mean of its divisors is an integer number (5242735260).

Almost surely, 2^209534069568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209534069568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293593174560).

209534069568 is an abundant number, since it is smaller than the sum of its proper divisors (377652279552).

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

209534069568 is a wasteful number, since it uses less digits than its factorization.

209534069568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20024 (or 20014 counting only the distinct ones).

The product of its (nonzero) digits is 13996800, while the sum is 57.

The spelling of 209534069568 in words is "two hundred nine billion, five hundred thirty-four million, sixty-nine thousand, five hundred sixty-eight".