13664551 has 4 divisors (see below), whose sum is σ = 13837600. Its totient is φ = 13491504.

The previous prime is 13664543. The next prime is 13664569. The reversal of 13664551 is 15546631.

13664551 is digitally balanced in base 3, because in such base 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 an emirpimes, since its reverse is a distinct semiprime: 15546631 = 317 ⋅49043.

It is a cyclic number.

It is not a de Polignac number, because 13664551 - 2³ = 13664543 is a prime.

It is a super-3 number, since 3×13664551³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13664531) 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, 86406 + ... + 86563.

It is an arithmetic number, because the mean of its divisors is an integer number (3459400).

Almost surely, 2^13664551 is an apocalyptic number.

13664551 is a deficient number, since it is larger than the sum of its proper divisors (173049).

13664551 is an equidigital number, since it uses as much as digits as its factorization.

13664551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173048.

The product of its digits is 10800, while the sum is 31.

The square root of 13664551 is about 3696.5593462029. The cubic root of 13664551 is about 239.0736921384.

The spelling of 13664551 in words is "thirteen million, six hundred sixty-four thousand, five hundred fifty-one".