13775565121 has 8 divisors (see below), whose sum is σ = 13867998120. Its totient is φ = 13683191808.

The previous prime is 13775565109. The next prime is 13775565149. The reversal of 13775565121 is 12156557731.

It can be written as a sum of positive squares in 4 ways, for example, as 397404225 + 13378160896 = 19935^2 + 115664^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13775565121 - 2⁷ = 13775564993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13775565161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 509475 + ... + 535831.

It is an arithmetic number, because the mean of its divisors is an integer number (1733499765).

Almost surely, 2^13775565121 is an apocalyptic number.

It is an amenable number.

13775565121 is a deficient number, since it is larger than the sum of its proper divisors (92432999).

13775565121 is a wasteful number, since it uses less digits than its factorization.

13775565121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29843.

The product of its digits is 220500, while the sum is 43.

The spelling of 13775565121 in words is "thirteen billion, seven hundred seventy-five million, five hundred sixty-five thousand, one hundred twenty-one".