16564645234772 has 24 divisors (see below), whose sum is σ = 29993889885960. Its totient is φ = 7995079935360.

The previous prime is 16564645234741. The next prime is 16564645234777. The reversal of 16564645234772 is 27743254646561.

It can be written as a sum of positive squares in 4 ways, for example, as 1910709056656 + 14653936178116 = 1382284^2 + 3828046^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16564645234777) 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, 14124323 + ... + 15252074.

It is an arithmetic number, because the mean of its divisors is an integer number (1249745411915).

Almost surely, 2^{16564645234772} is an apocalyptic number.

It is an amenable number.

16564645234772 is a deficient number, since it is larger than the sum of its proper divisors (13429244651188).

16564645234772 is a wasteful number, since it uses less digits than its factorization.

16564645234772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29381291 (or 29381289 counting only the distinct ones).

The product of its digits is 203212800, while the sum is 62.

The spelling of 16564645234772 in words is "sixteen trillion, five hundred sixty-four billion, six hundred forty-five million, two hundred thirty-four thousand, seven hundred seventy-two".