16564145 has 8 divisors (see below), whose sum is σ = 21406056. Its totient is φ = 12231936.

The previous prime is 16564129. The next prime is 16564157. The reversal of 16564145 is 54146561.

It can be written as a sum of positive squares in 4 ways, for example, as 1385329 + 15178816 = 1177^2 + 3896^2 .

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 16564145 - 2⁴ = 16564129 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127352 + ... + 127481.

It is an arithmetic number, because the mean of its divisors is an integer number (2675757).

Almost surely, 2^16564145 is an apocalyptic number.

It is an amenable number.

16564145 is a deficient number, since it is larger than the sum of its proper divisors (4841911).

16564145 is a wasteful number, since it uses less digits than its factorization.

16564145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254851.

The product of its digits is 14400, while the sum is 32.

The square root of 16564145 is about 4069.9072471004. The cubic root of 16564145 is about 254.9116443858.

The spelling of 16564145 in words is "sixteen million, five hundred sixty-four thousand, one hundred forty-five".