13109666905 has 4 divisors (see below), whose sum is σ = 15731600292. Its totient is φ = 10487733520.

The previous prime is 13109666903. The next prime is 13109666923. The reversal of 13109666905 is 50966690131.

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 1596162304 + 11513504601 = 39952^2 + 107301^2 .

It is not a de Polignac number, because 13109666905 - 2¹ = 13109666903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13109666903) 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, 1310966686 + ... + 1310966695.

It is an arithmetic number, because the mean of its divisors is an integer number (3932900073).

Almost surely, 2^13109666905 is an apocalyptic number.

It is an amenable number.

13109666905 is a deficient number, since it is larger than the sum of its proper divisors (2621933387).

13109666905 is an equidigital number, since it uses as much as digits as its factorization.

13109666905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2621933386.

The product of its (nonzero) digits is 262440, while the sum is 46.

The spelling of 13109666905 in words is "thirteen billion, one hundred nine million, six hundred sixty-six thousand, nine hundred five".