12691765063 has 4 divisors (see below), whose sum is σ = 12697093408. Its totient is φ = 12686436720.

The previous prime is 12691765057. The next prime is 12691765067. The reversal of 12691765063 is 36056719621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36056719621 = 13 ⋅2773593817.

It is a cyclic number.

It is not a de Polignac number, because 12691765063 - 2⁹ = 12691764551 is a prime.

It is a super-2 number, since 2×12691765063² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12691765067) 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, 2660598 + ... + 2665363.

It is an arithmetic number, because the mean of its divisors is an integer number (3174273352).

Almost surely, 2^12691765063 is an apocalyptic number.

12691765063 is a deficient number, since it is larger than the sum of its proper divisors (5328345).

12691765063 is an equidigital number, since it uses as much as digits as its factorization.

12691765063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5328344.

The product of its (nonzero) digits is 408240, while the sum is 46.

The spelling of 12691765063 in words is "twelve billion, six hundred ninety-one million, seven hundred sixty-five thousand, sixty-three".