16664117 has 4 divisors (see below), whose sum is σ = 16791456. Its totient is φ = 16536780.

The previous prime is 16664111. The next prime is 16664119. The reversal of 16664117 is 71146661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71146661 = 2381 ⋅29881.

It is a cyclic number.

It is not a de Polignac number, because 16664117 - 2⁸ = 16663861 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 (16664111) 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, 63473 + ... + 63734.

It is an arithmetic number, because the mean of its divisors is an integer number (4197864).

Almost surely, 2^16664117 is an apocalyptic number.

It is an amenable number.

16664117 is a deficient number, since it is larger than the sum of its proper divisors (127339).

16664117 is a wasteful number, since it uses less digits than its factorization.

16664117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127338.

The product of its digits is 6048, while the sum is 32.

The square root of 16664117 is about 4082.1706235776. The cubic root of 16664117 is about 255.4234512428.

The spelling of 16664117 in words is "sixteen million, six hundred sixty-four thousand, one hundred seventeen".