16213666 has 32 divisors (see below), whose sum is σ = 29703168. Its totient is φ = 6486480.

The previous prime is 16213663. The next prime is 16213667. The reversal of 16213666 is 66631261.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a pancake number, because a pancake can be divided into 16213666 parts by 5694 straight cuts.

It is not an unprimeable number, because it can be changed into a prime (16213663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13261 + ... + 14431.

It is an arithmetic number, because the mean of its divisors is an integer number (928224).

Almost surely, 2^16213666 is an apocalyptic number.

16213666 is a deficient number, since it is larger than the sum of its proper divisors (13489502).

16213666 is a wasteful number, since it uses less digits than its factorization.

16213666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1246.

The product of its digits is 7776, while the sum is 31.

The square root of 16213666 is about 4026.6196741187. The cubic root of 16213666 is about 253.1009299065.

The spelling of 16213666 in words is "sixteen million, two hundred thirteen thousand, six hundred sixty-six".