209552368512 has 128 divisors (see below), whose sum is σ = 586814780160. Its totient is φ = 66124726272.

The previous prime is 209552368483. The next prime is 209552368523. The reversal of 209552368512 is 215863255902.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 734403 + ... + 979005.

It is an arithmetic number, because the mean of its divisors is an integer number (4584490470).

Almost surely, 2^209552368512 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 209552368512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293407390080).

209552368512 is an abundant number, since it is smaller than the sum of its proper divisors (377262411648).

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

209552368512 is a wasteful number, since it uses less digits than its factorization.

209552368512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244740 (or 244728 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 48.

The spelling of 209552368512 in words is "two hundred nine billion, five hundred fifty-two million, three hundred sixty-eight thousand, five hundred twelve".