16656406 has 8 divisors (see below), whose sum is σ = 26906544. Its totient is φ = 7687560.

The previous prime is 16656389. The next prime is 16656421. The reversal of 16656406 is 60465661.

16656406 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320290 + ... + 320341.

It is an arithmetic number, because the mean of its divisors is an integer number (3363318).

Almost surely, 2^16656406 is an apocalyptic number.

16656406 is a deficient number, since it is larger than the sum of its proper divisors (10250138).

16656406 is a wasteful number, since it uses less digits than its factorization.

16656406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640646.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 16656406 is about 4081.2260412773. The cubic root of 16656406 is about 255.3840477328.

The spelling of 16656406 in words is "sixteen million, six hundred fifty-six thousand, four hundred six".