16205712999424 has 99 divisors (see below), whose sum is σ = 35082884676207. Its totient is φ = 7478786924544.

The previous prime is 16205712999419. The next prime is 16205712999431. The reversal of 16205712999424 is 42499921750261.

The square root of 16205712999424 is 4025632.

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

It can be written as a sum of positive squares in 4 ways, for example, as 663195239424 + 15542517760000 = 814368^2 + 3942400^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1674658074 + ... + 1674667750.

Almost surely, 2^{16205712999424} is an apocalyptic number.

16205712999424 is the 4025632-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16205712999424

16205712999424 is an abundant number, since it is smaller than the sum of its proper divisors (18877171676783).

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

16205712999424 is an frugal number, since it uses more digits than its factorization.

16205712999424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19400 (or 9692 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 61.

The spelling of 16205712999424 in words is "sixteen trillion, two hundred five billion, seven hundred twelve million, nine hundred ninety-nine thousand, four hundred twenty-four".