16605665064 has 32 divisors (see below), whose sum is σ = 46126848000. Its totient is φ = 5535221616.

The previous prime is 16605665053. The next prime is 16605665099. The reversal of 16605665064 is 46056650661.

It is a super-2 number, since 2×16605665064² (a number of 21 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 38438824 + ... + 38439255.

It is an arithmetic number, because the mean of its divisors is an integer number (1441464000).

Almost surely, 2^16605665064 is an apocalyptic number.

It is an amenable number.

16605665064 is an abundant number, since it is smaller than the sum of its proper divisors (29521182936).

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

16605665064 is a wasteful number, since it uses less digits than its factorization.

16605665064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76878094 (or 76878084 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 16605665064 in words is "sixteen billion, six hundred five million, six hundred sixty-five thousand, sixty-four".