16664375 has 40 divisors (see below), whose sum is σ = 25716768. Its totient is φ = 10512000.

The previous prime is 16664353. The next prime is 16664377. The reversal of 16664375 is 57346661.

It is a happy number.

It is not a de Polignac number, because 16664375 - 2⁸ = 16664119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16664377) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 56729 + ... + 57021.

Almost surely, 2^16664375 is an apocalyptic number.

16664375 is a deficient number, since it is larger than the sum of its proper divisors (9052393).

16664375 is an equidigital number, since it uses as much as digits as its factorization.

16664375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333 (or 318 counting only the distinct ones).

The product of its digits is 90720, while the sum is 38.

The square root of 16664375 is about 4082.2022242902. The cubic root of 16664375 is about 255.4247694227.

The spelling of 16664375 in words is "sixteen million, six hundred sixty-four thousand, three hundred seventy-five".