13664425 has 12 divisors (see below), whose sum is σ = 16990480. Its totient is φ = 10901520.

The previous prime is 13664419. The next prime is 13664429. The reversal of 13664425 is 52446631.

13664425 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13664425 - 2¹⁹ = 13140137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13664429) 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, 15034 + ... + 15916.

Almost surely, 2^13664425 is an apocalyptic number.

It is an amenable number.

13664425 is a deficient number, since it is larger than the sum of its proper divisors (3326055).

13664425 is an equidigital number, since it uses as much as digits as its factorization.

13664425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512 (or 1507 counting only the distinct ones).

The product of its digits is 17280, while the sum is 31.

The square root of 13664425 is about 3696.5423032883. The cubic root of 13664425 is about 239.0729573081.

The spelling of 13664425 in words is "thirteen million, six hundred sixty-four thousand, four hundred twenty-five".