12812775691 has 4 divisors (see below), whose sum is σ = 12817644552. Its totient is φ = 12807906832.

The previous prime is 12812775673. The next prime is 12812775721. The reversal of 12812775691 is 19657721821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19657721821 = 9839 ⋅1997939.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12812775691 is a prime.

It is a super-3 number, since 3×12812775691³ (a number of 31 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12812775601) 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, 2430481 + ... + 2435746.

It is an arithmetic number, because the mean of its divisors is an integer number (3204411138).

Almost surely, 2^12812775691 is an apocalyptic number.

12812775691 is a deficient number, since it is larger than the sum of its proper divisors (4868861).

12812775691 is an equidigital number, since it uses as much as digits as its factorization.

12812775691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4868860.

The product of its digits is 423360, while the sum is 49.

The spelling of 12812775691 in words is "twelve billion, eight hundred twelve million, seven hundred seventy-five thousand, six hundred ninety-one".