16664371 has 4 divisors (see below), whose sum is σ = 16707600. Its totient is φ = 16621144.

The previous prime is 16664353. The next prime is 16664377. The reversal of 16664371 is 17346661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16664371 - 2¹⁵ = 16631603 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 21031 + ... + 21808.

It is an arithmetic number, because the mean of its divisors is an integer number (4176900).

Almost surely, 2^16664371 is an apocalyptic number.

16664371 is a deficient number, since it is larger than the sum of its proper divisors (43229).

16664371 is an equidigital number, since it uses as much as digits as its factorization.

16664371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43228.

The product of its digits is 18144, while the sum is 34.

The square root of 16664371 is about 4082.2017343586. The cubic root of 16664371 is about 255.4247489859.

The spelling of 16664371 in words is "sixteen million, six hundred sixty-four thousand, three hundred seventy-one".