16565646944 has 48 divisors (see below), whose sum is σ = 40661139456. Its totient is φ = 6454147200.

The previous prime is 16565646863. The next prime is 16565646959. The reversal of 16565646944 is 44964656561.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a self number, because there is not a number n which added to its sum of digits gives 16565646944.

It is a congruent number.

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, 3359072 + ... + 3363999.

It is an arithmetic number, because the mean of its divisors is an integer number (847107072).

Almost surely, 2^16565646944 is an apocalyptic number.

16565646944 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

16565646944 is an abundant number, since it is smaller than the sum of its proper divisors (24095492512).

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

16565646944 is a wasteful number, since it uses less digits than its factorization.

16565646944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6723099 (or 6723091 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 56.

The spelling of 16565646944 in words is "sixteen billion, five hundred sixty-five million, six hundred forty-six thousand, nine hundred forty-four".