13664533 has 2 divisors, whose sum is σ = 13664534. Its totient is φ = 13664532.

The previous prime is 13664531. The next prime is 13664543. The reversal of 13664533 is 33546631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7524049 + 6140484 = 2743^2 + 2478^2 .

It is an emirp because it is prime and its reverse (33546631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13664533 - 2¹ = 13664531 is a prime.

Together with 13664531, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 13664495 and 13664504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13664531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6832266 + 6832267.

It is an arithmetic number, because the mean of its divisors is an integer number (6832267).

Almost surely, 2^13664533 is an apocalyptic number.

It is an amenable number.

13664533 is a deficient number, since it is larger than the sum of its proper divisors (1).

13664533 is an equidigital number, since it uses as much as digits as its factorization.

13664533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 31.

The square root of 13664533 is about 3696.5569115056. The cubic root of 13664533 is about 239.0735871629.

The spelling of 13664533 in words is "thirteen million, six hundred sixty-four thousand, five hundred thirty-three".