16664147 has 4 divisors (see below), whose sum is σ = 16743336. Its totient is φ = 16584960.

The previous prime is 16664129. The next prime is 16664149. The reversal of 16664147 is 74146661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74146661 = 439 ⋅168899.

It is a cyclic number.

It is not a de Polignac number, because 16664147 - 2¹⁸ = 16402003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16664149) 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, 39278 + ... + 39699.

It is an arithmetic number, because the mean of its divisors is an integer number (4185834).

Almost surely, 2^16664147 is an apocalyptic number.

16664147 is a deficient number, since it is larger than the sum of its proper divisors (79189).

16664147 is an equidigital number, since it uses as much as digits as its factorization.

16664147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79188.

The product of its digits is 24192, while the sum is 35.

The square root of 16664147 is about 4082.1742980916. The cubic root of 16664147 is about 255.4236045202.

The spelling of 16664147 in words is "sixteen million, six hundred sixty-four thousand, one hundred forty-seven".