16664587 has 2 divisors, whose sum is σ = 16664588. Its totient is φ = 16664586.

The previous prime is 16664579. The next prime is 16664611. The reversal of 16664587 is 78546661.

It is a happy number.

16664587 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16664587 - 2³ = 16664579 is a prime.

It is not a weakly prime, because it can be changed into another prime (16664507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8332293 + 8332294.

It is an arithmetic number, because the mean of its divisors is an integer number (8332294).

Almost surely, 2^16664587 is an apocalyptic number.

16664587 is a deficient number, since it is larger than the sum of its proper divisors (1).

16664587 is an equidigital number, since it uses as much as digits as its factorization.

16664587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 43.

The square root of 16664587 is about 4082.2281905842. The cubic root of 16664587 is about 255.4258525680.

The spelling of 16664587 in words is "sixteen million, six hundred sixty-four thousand, five hundred eighty-seven".