14215666 has 4 divisors (see below), whose sum is σ = 21323502. Its totient is φ = 7107832.

The previous prime is 14215661. The next prime is 14215681. The reversal of 14215666 is 66651241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66651241 = 83 ⋅803027.

It can be written as a sum of positive squares in only one way, i.e., 13535041 + 680625 = 3679^2 + 825^2 .

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 not an unprimeable number, because it can be changed into a prime (14215661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3553915 + ... + 3553918.

Almost surely, 2^14215666 is an apocalyptic number.

14215666 is a deficient number, since it is larger than the sum of its proper divisors (7107836).

14215666 is an equidigital number, since it uses as much as digits as its factorization.

14215666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7107835.

The product of its digits is 8640, while the sum is 31.

The square root of 14215666 is about 3770.3668256550. The cubic root of 14215666 is about 242.2455104687.

The spelling of 14215666 in words is "fourteen million, two hundred fifteen thousand, six hundred sixty-six".