12691236481 has 8 divisors (see below), whose sum is σ = 15822840384. Its totient is φ = 9889275120.

The previous prime is 12691236479. The next prime is 12691236487. The reversal of 12691236481 is 18463219621.

12691236481 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 12691236481 - 2¹ = 12691236479 is a prime.

It is a super-2 number, since 2×12691236481² (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 (12691236487) 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 7 ways as a sum of consecutive naturals, for example, 82410550 + ... + 82410703.

It is an arithmetic number, because the mean of its divisors is an integer number (1977855048).

Almost surely, 2^12691236481 is an apocalyptic number.

12691236481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12691236481 is a deficient number, since it is larger than the sum of its proper divisors (3131603903).

12691236481 is a wasteful number, since it uses less digits than its factorization.

12691236481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164821271.

The product of its digits is 124416, while the sum is 43.

The spelling of 12691236481 in words is "twelve billion, six hundred ninety-one million, two hundred thirty-six thousand, four hundred eighty-one".