16664323 has 4 divisors (see below), whose sum is σ = 17946208. Its totient is φ = 15382440.

The previous prime is 16664321. The next prime is 16664341. The reversal of 16664323 is 32346661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32346661 = 557 ⋅58073.

It is a cyclic number.

It is not a de Polignac number, because 16664323 - 2¹ = 16664321 is a prime.

It is a super-2 number, since 2×16664323² = 555399322096658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16664321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640923 + ... + 640948.

It is an arithmetic number, because the mean of its divisors is an integer number (4486552).

Almost surely, 2^16664323 is an apocalyptic number.

16664323 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

16664323 is a deficient number, since it is larger than the sum of its proper divisors (1281885).

16664323 is a wasteful number, since it uses less digits than its factorization.

16664323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281884.

The product of its digits is 15552, while the sum is 31.

The square root of 16664323 is about 4082.1958551740. The cubic root of 16664323 is about 255.4245037441.

The spelling of 16664323 in words is "sixteen million, six hundred sixty-four thousand, three hundred twenty-three".