13640404109 has 4 divisors (see below), whose sum is σ = 13656662880. Its totient is φ = 13624145340.

The previous prime is 13640404073. The next prime is 13640404153. The reversal of 13640404109 is 90140404631.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90140404631 = 17 ⋅5302376743.

It is a cyclic number.

It is not a de Polignac number, because 13640404109 - 2¹⁶ = 13640338573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13640404159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8128127 + ... + 8129804.

It is an arithmetic number, because the mean of its divisors is an integer number (3414165720).

Almost surely, 2^13640404109 is an apocalyptic number.

It is an amenable number.

13640404109 is a deficient number, since it is larger than the sum of its proper divisors (16258771).

13640404109 is an equidigital number, since it uses as much as digits as its factorization.

13640404109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16258770.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 13640404109 in words is "thirteen billion, six hundred forty million, four hundred four thousand, one hundred nine".