13696666 has 4 divisors (see below), whose sum is σ = 20545002. Its totient is φ = 6848332.

The previous prime is 13696649. The next prime is 13696667. The reversal of 13696666 is 66669631.

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., 12924025 + 772641 = 3595^2 + 879^2 .

It is not an unprimeable number, because it can be changed into a prime (13696667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3424165 + ... + 3424168.

Almost surely, 2^13696666 is an apocalyptic number.

13696666 is a deficient number, since it is larger than the sum of its proper divisors (6848336).

13696666 is an equidigital number, since it uses as much as digits as its factorization.

13696666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6848335.

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

The square root of 13696666 is about 3700.9007011807. The cubic root of 13696666 is about 239.2608392689.

The spelling of 13696666 in words is "thirteen million, six hundred ninety-six thousand, six hundred sixty-six".