13625666 has 4 divisors (see below), whose sum is σ = 20438502. Its totient is φ = 6812832.

The previous prime is 13625663. The next prime is 13625693. The reversal of 13625666 is 66652631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66652631 = 17 ⋅3920743.

It can be written as a sum of positive squares in only one way, i.e., 7480225 + 6145441 = 2735^2 + 2479^2 .

It is a super-3 number, since 3×13625666³ (a number of 22 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (13625663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3406415 + ... + 3406418.

Almost surely, 2^13625666 is an apocalyptic number.

13625666 is a deficient number, since it is larger than the sum of its proper divisors (6812836).

13625666 is an equidigital number, since it uses as much as digits as its factorization.

13625666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6812835.

The product of its digits is 38880, while the sum is 35.

The square root of 13625666 is about 3691.2959783794. The cubic root of 13625666 is about 238.8467005923.

The spelling of 13625666 in words is "thirteen million, six hundred twenty-five thousand, six hundred sixty-six".