13171666 has 16 divisors (see below), whose sum is σ = 20245464. Its totient is φ = 6424704.

The previous prime is 13171661. The next prime is 13171673. The reversal of 13171666 is 66617131.

It can be written as a sum of positive squares in 4 ways, for example, as 9641025 + 3530641 = 3105^2 + 1879^2 .

It is not an unprimeable number, because it can be changed into a prime (13171661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32980 + ... + 33376.

Almost surely, 2^13171666 is an apocalyptic number.

13171666 is a deficient number, since it is larger than the sum of its proper divisors (7073798).

13171666 is a wasteful number, since it uses less digits than its factorization.

13171666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765.

The product of its digits is 4536, while the sum is 31.

The square root of 13171666 is about 3629.2789917558. The cubic root of 13171666 is about 236.1639313964.

Adding to 13171666 its reverse (66617131), we get a palindrome (79788797).

The spelling of 13171666 in words is "thirteen million, one hundred seventy-one thousand, six hundred sixty-six".