16021605609 has 6 divisors (see below), whose sum is σ = 23142319226. Its totient is φ = 10681070400.

The previous prime is 16021605569. The next prime is 16021605637. The reversal of 16021605609 is 90650612061.

16021605609 is a `hidden beast` number, since 16 + 0 + 21 + 60 + 560 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 9433848384 + 6587757225 = 97128^2 + 81165^2 .

It is not a de Polignac number, because 16021605609 - 2¹⁷ = 16021474537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16021605689) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 890089192 + ... + 890089209.

Almost surely, 2^16021605609 is an apocalyptic number.

It is an amenable number.

16021605609 is a deficient number, since it is larger than the sum of its proper divisors (7120713617).

16021605609 is a wasteful number, since it uses less digits than its factorization.

16021605609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1780178407 (or 1780178404 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The spelling of 16021605609 in words is "sixteen billion, twenty-one million, six hundred five thousand, six hundred nine".