16664069 has 4 divisors (see below), whose sum is σ = 16683744. Its totient is φ = 16644396.

The previous prime is 16664059. The next prime is 16664107. The reversal of 16664069 is 96046661.

16664069 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16664069 is a prime.

It is a super-2 number, since 2×16664069² = 555382391273522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16664059) 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, 8507 + ... + 10280.

It is an arithmetic number, because the mean of its divisors is an integer number (4170936).

Almost surely, 2^16664069 is an apocalyptic number.

It is an amenable number.

16664069 is a deficient number, since it is larger than the sum of its proper divisors (19675).

16664069 is an equidigital number, since it uses as much as digits as its factorization.

16664069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19674.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 16664069 is about 4082.1647443483. The cubic root of 16664069 is about 255.4232059985.

The spelling of 16664069 in words is "sixteen million, six hundred sixty-four thousand, sixty-nine".