16045421666 has 16 divisors (see below), whose sum is σ = 24435835704. Its totient is φ = 7901048064.

The previous prime is 16045421653. The next prime is 16045421671. The reversal of 16045421666 is 66612454061.

16045421666 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 1968785641 + 14076636025 = 44371^2 + 118645^2 .

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 190625 + ... + 261588.

Almost surely, 2^16045421666 is an apocalyptic number.

16045421666 is a deficient number, since it is larger than the sum of its proper divisors (8390414038).

16045421666 is a wasteful number, since it uses less digits than its factorization.

16045421666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452485.

The product of its (nonzero) digits is 207360, while the sum is 41.

The spelling of 16045421666 in words is "sixteen billion, forty-five million, four hundred twenty-one thousand, six hundred sixty-six".