13247666 has 4 divisors (see below), whose sum is σ = 19871502. Its totient is φ = 6623832.

The previous prime is 13247657. The next prime is 13247669. The reversal of 13247666 is 66674231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 7102225 + 6145441 = 2665^2 + 2479^2 .

It is not an unprimeable number, because it can be changed into a prime (13247669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3311915 + ... + 3311918.

Almost surely, 2^13247666 is an apocalyptic number.

13247666 is a deficient number, since it is larger than the sum of its proper divisors (6623836).

13247666 is an equidigital number, since it uses as much as digits as its factorization.

13247666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6623835.

The product of its digits is 36288, while the sum is 35.

The square root of 13247666 is about 3639.7343309643. The cubic root of 13247666 is about 236.6172794740.

The spelling of 13247666 in words is "thirteen million, two hundred forty-seven thousand, six hundred sixty-six".