13249666 has 4 divisors (see below), whose sum is σ = 19874502. Its totient is φ = 6624832.

The previous prime is 13249657. The next prime is 13249667. The reversal of 13249666 is 66694231.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66694231 = 2557 ⋅26083.

It can be written as a sum of positive squares in only one way, i.e., 7590025 + 5659641 = 2755^2 + 2379^2 .

It is a super-2 number, since 2×13249666² = 351107298223112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13249667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3312415 + ... + 3312418.

Almost surely, 2^13249666 is an apocalyptic number.

13249666 is a deficient number, since it is larger than the sum of its proper divisors (6624836).

13249666 is an equidigital number, since it uses as much as digits as its factorization.

13249666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6624835.

The product of its digits is 46656, while the sum is 37.

The square root of 13249666 is about 3640.0090659228. The cubic root of 13249666 is about 236.6291862443.

The spelling of 13249666 in words is "thirteen million, two hundred forty-nine thousand, six hundred sixty-six".