16565441664 has 64 divisors (see below), whose sum is σ = 44018100000. Its totient is φ = 5519788032.

The previous prime is 16565441657. The next prime is 16565441681. The reversal of 16565441664 is 46614456561.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1337452 + ... + 1349780.

Almost surely, 2^16565441664 is an apocalyptic number.

It is an amenable number.

16565441664 is an abundant number, since it is smaller than the sum of its proper divisors (27452658336).

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

16565441664 is a wasteful number, since it uses less digits than its factorization.

16565441664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15845 (or 15833 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 48.

The spelling of 16565441664 in words is "sixteen billion, five hundred sixty-five million, four hundred forty-one thousand, six hundred sixty-four".