16366643 has 4 divisors (see below), whose sum is σ = 16931040. Its totient is φ = 15802248.

The previous prime is 16366621. The next prime is 16366661. The reversal of 16366643 is 34666361.

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 16366643 - 2¹⁴ = 16350259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16366663) 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, 282155 + ... + 282212.

It is an arithmetic number, because the mean of its divisors is an integer number (4232760).

Almost surely, 2^16366643 is an apocalyptic number.

16366643 is a deficient number, since it is larger than the sum of its proper divisors (564397).

16366643 is an equidigital number, since it uses as much as digits as its factorization.

16366643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564396.

The product of its digits is 46656, while the sum is 35.

The square root of 16366643 is about 4045.5707879111. The cubic root of 16366643 is about 253.8944474315.

The spelling of 16366643 in words is "sixteen million, three hundred sixty-six thousand, six hundred forty-three".