16406566 has 8 divisors (see below), whose sum is σ = 26847144. Its totient is φ = 7457520.

The previous prime is 16406563. The next prime is 16406591. The reversal of 16406566 is 66560461.

16406566 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 not an unprimeable number, because it can be changed into a prime (16406563) 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, 372855 + ... + 372898.

It is an arithmetic number, because the mean of its divisors is an integer number (3355893).

Almost surely, 2^16406566 is an apocalyptic number.

16406566 is a deficient number, since it is larger than the sum of its proper divisors (10440578).

16406566 is a wasteful number, since it uses less digits than its factorization.

16406566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745766.

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

The square root of 16406566 is about 4050.5019442040. The cubic root of 16406566 is about 254.1007205901.

It can be divided in two parts, 16 and 406566, that multiplied together give a palindrome (6505056).

The spelling of 16406566 in words is "sixteen million, four hundred six thousand, five hundred sixty-six".