16663667 has 4 divisors (see below), whose sum is σ = 16683840. Its totient is φ = 16643496.

The previous prime is 16663657. The next prime is 16663681. The reversal of 16663667 is 76636661.

It is a happy number.

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 16663667 - 2⁴ = 16663651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16663607) 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, 8792 + ... + 10517.

It is an arithmetic number, because the mean of its divisors is an integer number (4170960).

Almost surely, 2^16663667 is an apocalyptic number.

16663667 is a deficient number, since it is larger than the sum of its proper divisors (20173).

16663667 is an equidigital number, since it uses as much as digits as its factorization.

16663667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20172.

The product of its digits is 163296, while the sum is 41.

The square root of 16663667 is about 4082.1155054702. The cubic root of 16663667 is about 255.4211520593.

The spelling of 16663667 in words is "sixteen million, six hundred sixty-three thousand, six hundred sixty-seven".