12766774691 has 16 divisors (see below), whose sum is σ = 14377461120. Its totient is φ = 11235880320.

The previous prime is 12766774687. The next prime is 12766774717. The reversal of 12766774691 is 19647766721.

It is a cyclic number.

It is not a de Polignac number, because 12766774691 - 2² = 12766774687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12766774681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65981 + ... + 172878.

It is an arithmetic number, because the mean of its divisors is an integer number (898591320).

Almost surely, 2^12766774691 is an apocalyptic number.

12766774691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12766774691 is a deficient number, since it is larger than the sum of its proper divisors (1610686429).

12766774691 is a wasteful number, since it uses less digits than its factorization.

12766774691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239026.

The product of its digits is 5334336, while the sum is 56.

The spelling of 12766774691 in words is "twelve billion, seven hundred sixty-six million, seven hundred seventy-four thousand, six hundred ninety-one".