13844720605 has 4 divisors (see below), whose sum is σ = 16613664732. Its totient is φ = 11075776480.

The previous prime is 13844720587. The next prime is 13844720623. The reversal of 13844720605 is 50602744831.

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

It is an interprime number because it is at equal distance from previous prime (13844720587) and next prime (13844720623).

It can be written as a sum of positive squares in 2 ways, for example, as 8306681881 + 5538038724 = 91141^2 + 74418^2 .

It is not a de Polignac number, because 13844720605 - 2⁵ = 13844720573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1384472056 + ... + 1384472065.

It is an arithmetic number, because the mean of its divisors is an integer number (4153416183).

Almost surely, 2^13844720605 is an apocalyptic number.

It is an amenable number.

13844720605 is a deficient number, since it is larger than the sum of its proper divisors (2768944127).

13844720605 is an equidigital number, since it uses as much as digits as its factorization.

13844720605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2768944126.

The product of its (nonzero) digits is 161280, while the sum is 40.

It can be divided in two parts, 13844 and 720605, that added together give a square (734449 = 857²).

The spelling of 13844720605 in words is "thirteen billion, eight hundred forty-four million, seven hundred twenty thousand, six hundred five".