16581884391396 has 189 divisors, whose sum is σ = 44154445621419. Its totient is φ = 5446301006592.

The previous prime is 16581884391377. The next prime is 16581884391403. The reversal of 16581884391396 is 69319348818561.

The square root of 16581884391396 is 4072086.

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

16581884391396 is a `hidden beast` number, since 1 + 6 + 5 + 8 + 188 + 439 + 1 + 3 + 9 + 6 = 666.

16581884391396 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 6334715136996 + 10247169254400 = 2516886^2 + 3201120^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 16052162496 + ... + 16052163528.

Almost surely, 2^{16581884391396} is an apocalyptic number.

16581884391396 is the 4072086-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16581884391396

16581884391396 is an abundant number, since it is smaller than the sum of its proper divisors (27572561230023).

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

16581884391396 is an frugal number, since it uses more digits than its factorization.

16581884391396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2234 (or 1111 counting only the distinct ones).

The product of its digits is 268738560, while the sum is 72.

The spelling of 16581884391396 in words is "sixteen trillion, five hundred eighty-one billion, eight hundred eighty-four million, three hundred ninety-one thousand, three hundred ninety-six".