13405568369 has 6 divisors (see below), whose sum is σ = 13455223074. Its totient is φ = 13355927760.

The previous prime is 13405568353. The next prime is 13405568401. The reversal of 13405568369 is 96386550431.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12212902144 + 1192666225 = 110512^2 + 34535^2 .

It is not a de Polignac number, because 13405568369 - 2⁴ = 13405568353 is a prime.

It is a super-2 number, since 2×13405568369² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13405568069) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1937414 + ... + 1944320.

It is an arithmetic number, because the mean of its divisors is an integer number (2242537179).

Almost surely, 2^13405568369 is an apocalyptic number.

It is an amenable number.

13405568369 is a deficient number, since it is larger than the sum of its proper divisors (49654705).

13405568369 is an frugal number, since it uses more digits than its factorization.

13405568369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14095 (or 7188 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 50.

The spelling of 13405568369 in words is "thirteen billion, four hundred five million, five hundred sixty-eight thousand, three hundred sixty-nine".