12697789217 has 4 divisors (see below), whose sum is σ = 12698110356. Its totient is φ = 12697468080.

The previous prime is 12697789207. The next prime is 12697789267. The reversal of 12697789217 is 71298779621.

12697789217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71298779621 = 158749 ⋅449129.

It can be written as a sum of positive squares in 2 ways, for example, as 10016206561 + 2681582656 = 100081^2 + 51784^2 .

It is a cyclic number.

It is not a de Polignac number, because 12697789217 - 2¹⁰ = 12697788193 is a prime.

It is a super-2 number, since 2×12697789217² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12697789207) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 91298 + ... + 183659.

It is an arithmetic number, because the mean of its divisors is an integer number (3174527589).

Almost surely, 2^12697789217 is an apocalyptic number.

It is an amenable number.

12697789217 is a deficient number, since it is larger than the sum of its proper divisors (321139).

12697789217 is an equidigital number, since it uses as much as digits as its factorization.

12697789217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321138.

The product of its digits is 5334336, while the sum is 59.

The spelling of 12697789217 in words is "twelve billion, six hundred ninety-seven million, seven hundred eighty-nine thousand, two hundred seventeen".