13217666 has 16 divisors (see below), whose sum is σ = 24719040. Its totient is φ = 5149680.

The previous prime is 13217647. The next prime is 13217671. The reversal of 13217666 is 66671231.

13217666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42761 + ... + 43068.

It is an arithmetic number, because the mean of its divisors is an integer number (1544940).

Almost surely, 2^13217666 is an apocalyptic number.

13217666 is a deficient number, since it is larger than the sum of its proper divisors (11501374).

13217666 is a wasteful number, since it uses less digits than its factorization.

13217666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85849.

The product of its digits is 9072, while the sum is 32.

The square root of 13217666 is about 3635.6108152551. The cubic root of 13217666 is about 236.4385339387.

Adding to 13217666 its reverse (66671231), we get a palindrome (79888897).

The spelling of 13217666 in words is "thirteen million, two hundred seventeen thousand, six hundred sixty-six".