13663569 has 4 divisors (see below), whose sum is σ = 18218096. Its totient is φ = 9109044.

The previous prime is 13663501. The next prime is 13663577. The reversal of 13663569 is 96536631.

13663569 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 13663569 - 2¹¹ = 13661521 is a prime.

It is a super-2 number, since 2×13663569² = 373386235635522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13664569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2277259 + ... + 2277264.

It is an arithmetic number, because the mean of its divisors is an integer number (4554524).

Almost surely, 2^13663569 is an apocalyptic number.

It is an amenable number.

13663569 is a deficient number, since it is larger than the sum of its proper divisors (4554527).

13663569 is an equidigital number, since it uses as much as digits as its factorization.

13663569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4554526.

The product of its digits is 87480, while the sum is 39.

The square root of 13663569 is about 3696.4265175978. The cubic root of 13663569 is about 239.0679650081.

The spelling of 13663569 in words is "thirteen million, six hundred sixty-three thousand, five hundred sixty-nine".