16664047 has 4 divisors (see below), whose sum is σ = 16678816. Its totient is φ = 16649280.

The previous prime is 16664027. The next prime is 16664057. The reversal of 16664047 is 74046661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74046661 = 13 ⋅5695897.

It is a cyclic number.

It is not a de Polignac number, because 16664047 - 2¹¹ = 16661999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16664017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5538 + ... + 7999.

It is an arithmetic number, because the mean of its divisors is an integer number (4169704).

Almost surely, 2^16664047 is an apocalyptic number.

16664047 is a deficient number, since it is larger than the sum of its proper divisors (14769).

16664047 is a wasteful number, since it uses less digits than its factorization.

16664047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14768.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 16664047 is about 4082.1620496987. The cubic root of 16664047 is about 255.4230935948.

The spelling of 16664047 in words is "sixteen million, six hundred sixty-four thousand, forty-seven".