16568921404036 has 81 divisors (see below), whose sum is σ = 30634074568279. Its totient is φ = 7840715798608.

The previous prime is 16568921403973. The next prime is 16568921404081. The reversal of 16568921404036 is 63040412986561.

The square root of 16568921404036 is 4070494.

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

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 20034971055 + ... + 20034971881.

Almost surely, 2^{16568921404036} is an apocalyptic number.

16568921404036 is the 4070494-th square number.

It is an amenable number.

16568921404036 is a deficient number, since it is larger than the sum of its proper divisors (14065153164243).

16568921404036 is an frugal number, since it uses more digits than its factorization.

16568921404036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1918 (or 959 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 55.

The spelling of 16568921404036 in words is "sixteen trillion, five hundred sixty-eight billion, nine hundred twenty-one million, four hundred four thousand, thirty-six".