13641809809 has 4 divisors (see below), whose sum is σ = 13642047216. Its totient is φ = 13641572404.

The previous prime is 13641809807. The next prime is 13641809821. The reversal of 13641809809 is 90890814631.

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: 90890814631 = 6637 ⋅13694563.

It is a cyclic number.

It is not a de Polignac number, because 13641809809 - 2¹ = 13641809807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13641809803) 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, 27582 + ... + 167464.

It is an arithmetic number, because the mean of its divisors is an integer number (3410511804).

Almost surely, 2^13641809809 is an apocalyptic number.

It is an amenable number.

13641809809 is a deficient number, since it is larger than the sum of its proper divisors (237407).

13641809809 is an equidigital number, since it uses as much as digits as its factorization.

13641809809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237406.

The product of its (nonzero) digits is 373248, while the sum is 49.

The spelling of 13641809809 in words is "thirteen billion, six hundred forty-one million, eight hundred nine thousand, eight hundred nine".