16566601 has 8 divisors (see below), whose sum is σ = 17328960. Its totient is φ = 15807792.

The previous prime is 16566587. The next prime is 16566611. The reversal of 16566601 is 10666561.

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

It is a cyclic number.

It is not a de Polignac number, because 16566601 - 2¹⁵ = 16533833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16566611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14611 + ... + 15703.

It is an arithmetic number, because the mean of its divisors is an integer number (2166120).

Almost surely, 2^16566601 is an apocalyptic number.

It is an amenable number.

16566601 is a deficient number, since it is larger than the sum of its proper divisors (762359).

16566601 is a wasteful number, since it uses less digits than its factorization.

16566601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 16566601 is about 4070.2089626947. The cubic root of 16566601 is about 254.9242425219.

It can be divided in two parts, 165 and 66601, that added together give a palindrome (66766).

The spelling of 16566601 in words is "sixteen million, five hundred sixty-six thousand, six hundred one".