13666725 has 60 divisors (see below), whose sum is σ = 26872164. Its totient is φ = 6842880.

The previous prime is 13666721. The next prime is 13666729. The reversal of 13666725 is 52766631.

It is an interprime number because it is at equal distance from previous prime (13666721) and next prime (13666729).

It can be written as a sum of positive squares in 6 ways, for example, as 116964 + 13549761 = 342^2 + 3681^2 .

It is not a de Polignac number, because 13666725 - 2² = 13666721 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13666725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13666721) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 34227 + ... + 34623.

Almost surely, 2^13666725 is an apocalyptic number.

13666725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13666725 is a deficient number, since it is larger than the sum of its proper divisors (13205439).

13666725 is a wasteful number, since it uses less digits than its factorization.

13666725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436 (or 422 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 13666725 is about 3696.8533917374. The cubic root of 13666725 is about 239.0863701655.

The spelling of 13666725 in words is "thirteen million, six hundred sixty-six thousand, seven hundred twenty-five".