13639205625809 has 4 divisors (see below), whose sum is σ = 13971869177700. Its totient is φ = 13306542073920.

The previous prime is 13639205625803. The next prime is 13639205625823. The reversal of 13639205625809 is 90852650293631.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1519233735184 + 12119971890625 = 1232572^2 + 3481375^2 .

It is a cyclic number.

It is not a de Polignac number, because 13639205625809 - 2²⁰ = 13639204577233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13639205625803) 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, 166331775884 + ... + 166331775965.

It is an arithmetic number, because the mean of its divisors is an integer number (3492967294425).

Almost surely, 2^{13639205625809} is an apocalyptic number.

It is an amenable number.

13639205625809 is a deficient number, since it is larger than the sum of its proper divisors (332663551891).

13639205625809 is an equidigital number, since it uses as much as digits as its factorization.

13639205625809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332663551890.

The product of its (nonzero) digits is 20995200, while the sum is 59.

The spelling of 13639205625809 in words is "thirteen trillion, six hundred thirty-nine billion, two hundred five million, six hundred twenty-five thousand, eight hundred nine".