16664563 has 2 divisors, whose sum is σ = 16664564. Its totient is φ = 16664562.

The previous prime is 16664561. The next prime is 16664579. The reversal of 16664563 is 36546661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16664563 - 2¹ = 16664561 is a prime.

Together with 16664561, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16664561) by changing a digit.

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 as a sum of consecutive naturals, namely, 8332281 + 8332282.

It is an arithmetic number, because the mean of its divisors is an integer number (8332282).

Almost surely, 2^16664563 is an apocalyptic number.

16664563 is a deficient number, since it is larger than the sum of its proper divisors (1).

16664563 is an equidigital number, since it uses as much as digits as its factorization.

16664563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 37.

The square root of 16664563 is about 4082.2252510120. The cubic root of 16664563 is about 255.4257299483.

The spelling of 16664563 in words is "sixteen million, six hundred sixty-four thousand, five hundred sixty-three".