16565021064 has 192 divisors, whose sum is σ = 48311303040. Its totient is φ = 5118059520.

The previous prime is 16565021003. The next prime is 16565021117. The reversal of 16565021064 is 46012056561.

16565021064 is a `hidden beast` number, since 16 + 565 + 0 + 21 + 0 + 64 = 666.

16565021064 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 47 ways as a sum of consecutive naturals, for example, 4694869 + ... + 4698395.

It is an arithmetic number, because the mean of its divisors is an integer number (251621370).

Almost surely, 2^16565021064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16565021064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24155651520).

16565021064 is an abundant number, since it is smaller than the sum of its proper divisors (31746281976).

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

16565021064 is a wasteful number, since it uses less digits than its factorization.

16565021064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3660 (or 3653 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 16565021064 in words is "sixteen billion, five hundred sixty-five million, twenty-one thousand, sixty-four".