209039155264 has 63 divisors (see below), whose sum is σ = 421589948157. Its totient is φ = 102838881024.

The previous prime is 209039155223. The next prime is 209039155301. The reversal of 209039155264 is 462551930902.

The square root of 209039155264 is 457208.

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., 12073614400 + 196965540864 = 109880^2 + 443808^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 245063062 + ... + 245063914.

It is an arithmetic number, because the mean of its divisors is an integer number (6691903939).

Almost surely, 2^209039155264 is an apocalyptic number.

209039155264 is the 457208-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209039155264

209039155264 is an abundant number, since it is smaller than the sum of its proper divisors (212550792893).

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

209039155264 is an frugal number, since it uses more digits than its factorization.

209039155264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1852 (or 922 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 46.

The spelling of 209039155264 in words is "two hundred nine billion, thirty-nine million, one hundred fifty-five thousand, two hundred sixty-four".