16564037666432 has 64 divisors (see below), whose sum is σ = 34745494730400. Its totient is φ = 7843852108800.

The previous prime is 16564037666389. The next prime is 16564037666471. The reversal of 16564037666432 is 23466673046561.

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

It is a super-2 number, since 2×16564037666432² (a number of 27 digits) contains 22 as substring.

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, 7433207 + ... + 9401097.

Almost surely, 2^{16564037666432} 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 16564037666432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17372747365200).

16564037666432 is an abundant number, since it is smaller than the sum of its proper divisors (18181457063968).

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

16564037666432 is a wasteful number, since it uses less digits than its factorization.

16564037666432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1971385 (or 1971373 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 59.

The spelling of 16564037666432 in words is "sixteen trillion, five hundred sixty-four billion, thirty-seven million, six hundred sixty-six thousand, four hundred thirty-two".