13966666 has 24 divisors (see below), whose sum is σ = 24839460. Its totient is φ = 5870592.

The previous prime is 13966651. The next prime is 13966669. The reversal of 13966666 is 66666931.

13966666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 13505625 + 461041 = 3675^2 + 679^2 .

It is a super-3 number, since 3×13966666³ (a number of 22 digits) contains 333 as substring.

13966666 is a modest number, since divided by 6666 gives 1396 as remainder.

It is not an unprimeable number, because it can be changed into a prime (13966669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3850 + ... + 6538.

Almost surely, 2^13966666 is an apocalyptic number.

13966666 is a deficient number, since it is larger than the sum of its proper divisors (10872794).

13966666 is a wasteful number, since it uses less digits than its factorization.

13966666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2758 (or 2751 counting only the distinct ones).

The product of its digits is 209952, while the sum is 43.

The square root of 13966666 is about 3737.2002889864. The cubic root of 13966666 is about 240.8227894422.

The spelling of 13966666 in words is "thirteen million, nine hundred sixty-six thousand, six hundred sixty-six".