209047541364 has 84 divisors (see below), whose sum is σ = 548637020484. Its totient is φ = 69664966272.

The previous prime is 209047541341. The next prime is 209047541389. The reversal of 209047541364 is 463145740902.

209047541364 is a `hidden beast` number, since 2 + 0 + 9 + 0 + 47 + 541 + 3 + 64 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 97317793764 + 111729747600 = 311958^2 + 334260^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 17189574 + ... + 17201730.

It is an arithmetic number, because the mean of its divisors is an integer number (6531393101).

Almost surely, 2^209047541364 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 209047541364, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274318510242).

209047541364 is an abundant number, since it is smaller than the sum of its proper divisors (339589479120).

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

209047541364 is a wasteful number, since it uses less digits than its factorization.

209047541364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18076 (or 18059 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 209047541364 in words is "two hundred nine billion, forty-seven million, five hundred forty-one thousand, three hundred sixty-four".