16664447 has 2 divisors, whose sum is σ = 16664448. Its totient is φ = 16664446.

The previous prime is 16664411. The next prime is 16664477. The reversal of 16664447 is 74446661.

It is a strong prime.

It is an emirp because it is prime and its reverse (74446661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16664447 - 2⁸ = 16664191 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16664447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16664477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8332223 + 8332224.

It is an arithmetic number, because the mean of its divisors is an integer number (8332224).

Almost surely, 2^16664447 is an apocalyptic number.

16664447 is a deficient number, since it is larger than the sum of its proper divisors (1).

16664447 is an equidigital number, since it uses as much as digits as its factorization.

16664447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 38.

The square root of 16664447 is about 4082.2110430501. The cubic root of 16664447 is about 255.4251372844.

The spelling of 16664447 in words is "sixteen million, six hundred sixty-four thousand, four hundred forty-seven".