16664747 has 8 divisors (see below), whose sum is σ = 18213120. Its totient is φ = 15121960.

The previous prime is 16664741. The next prime is 16664749. The reversal of 16664747 is 74746661.

It is a happy number.

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 16664747 - 2⁴ = 16664731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16664741) 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, 7154 + ... + 9192.

It is an arithmetic number, because the mean of its divisors is an integer number (2276640).

Almost surely, 2^16664747 is an apocalyptic number.

16664747 is a deficient number, since it is larger than the sum of its proper divisors (1548373).

16664747 is a wasteful number, since it uses less digits than its factorization.

16664747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2793.

The product of its digits is 169344, while the sum is 41.

The square root of 16664747 is about 4082.2477876778. The cubic root of 16664747 is about 255.4266700301.

The spelling of 16664747 in words is "sixteen million, six hundred sixty-four thousand, seven hundred forty-seven".