13121261165 has 8 divisors (see below), whose sum is σ = 15833478240. Its totient is φ = 10438365712.

The previous prime is 13121261117. The next prime is 13121261171. The reversal of 13121261165 is 56116212131.

13121261165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 13121261165 - 2¹² = 13121257069 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7329419 + ... + 7331208.

It is an arithmetic number, because the mean of its divisors is an integer number (1979184780).

Almost surely, 2^13121261165 is an apocalyptic number.

It is an amenable number.

13121261165 is a deficient number, since it is larger than the sum of its proper divisors (2712217075).

13121261165 is a wasteful number, since it uses less digits than its factorization.

13121261165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14660811.

The product of its digits is 2160, while the sum is 29.

Adding to 13121261165 its reverse (56116212131), we get a palindrome (69237473296).

The spelling of 13121261165 in words is "thirteen billion, one hundred twenty-one million, two hundred sixty-one thousand, one hundred sixty-five".