16642665009 has 24 divisors (see below), whose sum is σ = 24703398720. Its totient is φ = 10788998688.

The previous prime is 16642665007. The next prime is 16642665031. The reversal of 16642665009 is 90056624661.

16642665009 is a `hidden beast` number, since 166 + 426 + 65 + 0 + 0 + 9 = 666.

It is not a de Polignac number, because 16642665009 - 2¹ = 16642665007 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16642665007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 601522 + ... + 628580.

It is an arithmetic number, because the mean of its divisors is an integer number (1029308280).

Almost surely, 2^16642665009 is an apocalyptic number.

It is an amenable number.

16642665009 is a deficient number, since it is larger than the sum of its proper divisors (8060733711).

16642665009 is a wasteful number, since it uses less digits than its factorization.

16642665009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28949 (or 28946 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 16642665009 in words is "sixteen billion, six hundred forty-two million, six hundred sixty-five thousand, nine".