13661633 has 4 divisors (see below), whose sum is σ = 13683588. Its totient is φ = 13639680.

The previous prime is 13661623. The next prime is 13661647. The reversal of 13661633 is 33616631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33616631 = 163 ⋅206237.

It can be written as a sum of positive squares in 2 ways, for example, as 8334769 + 5326864 = 2887^2 + 2308^2 .

It is a cyclic number.

It is not a de Polignac number, because 13661633 - 2¹⁰ = 13660609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13661596 and 13661605.

It is not an unprimeable number, because it can be changed into a prime (13661603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10016 + ... + 11297.

It is an arithmetic number, because the mean of its divisors is an integer number (3420897).

Almost surely, 2^13661633 is an apocalyptic number.

It is an amenable number.

13661633 is a deficient number, since it is larger than the sum of its proper divisors (21955).

13661633 is an equidigital number, since it uses as much as digits as its factorization.

13661633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21954.

The product of its digits is 5832, while the sum is 29.

The square root of 13661633 is about 3696.1646337792. The cubic root of 13661633 is about 239.0566732429.

The spelling of 13661633 in words is "thirteen million, six hundred sixty-one thousand, six hundred thirty-three".