16564645256560 has 40 divisors (see below), whose sum is σ = 39040372841040. Its totient is φ = 6535092920832.

The previous prime is 16564645256543. The next prime is 16564645256561. The reversal of 16564645256560 is 6565254646561.

16564645256560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16564645256561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1418200090 + ... + 1418211769.

It is an arithmetic number, because the mean of its divisors is an integer number (976009321026).

Almost surely, 2^{16564645256560} is an apocalyptic number.

16564645256560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16564645256560 is an abundant number, since it is smaller than the sum of its proper divisors (22475727584480).

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

16564645256560 is a wasteful number, since it uses less digits than its factorization.

16564645256560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2836411945 (or 2836411939 counting only the distinct ones).

The product of its (nonzero) digits is 155520000, while the sum is 61.

The spelling of 16564645256560 in words is "sixteen trillion, five hundred sixty-four billion, six hundred forty-five million, two hundred fifty-six thousand, five hundred sixty".