16564493 has 8 divisors (see below), whose sum is σ = 18559200. Its totient is φ = 14651280.

The previous prime is 16564469. The next prime is 16564501. The reversal of 16564493 is 39446561.

16564493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16564493 - 2⁸ = 16564237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16564433) 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, 19943 + ... + 20756.

It is an arithmetic number, because the mean of its divisors is an integer number (2319900).

Almost surely, 2^16564493 is an apocalyptic number.

It is an amenable number.

16564493 is a deficient number, since it is larger than the sum of its proper divisors (1994707).

16564493 is a wasteful number, since it uses less digits than its factorization.

16564493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40747.

The product of its digits is 77760, while the sum is 38.

The square root of 16564493 is about 4069.9499996929. The cubic root of 16564493 is about 254.9134295394.

The spelling of 16564493 in words is "sixteen million, five hundred sixty-four thousand, four hundred ninety-three".