12688854779 has 4 divisors (see below), whose sum is σ = 12702170376. Its totient is φ = 12675539184.

The previous prime is 12688854749. The next prime is 12688854809. The reversal of 12688854779 is 97745888621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97745888621 = 225919 ⋅432659.

It is an interprime number because it is at equal distance from previous prime (12688854749) and next prime (12688854809).

It is a cyclic number.

It is not a de Polignac number, because 12688854779 - 2²⁴ = 12672077563 is a prime.

It is a super-2 number, since 2×12688854779² (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 (12688854749) 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 3 ways as a sum of consecutive naturals, for example, 6656369 + ... + 6658274.

It is an arithmetic number, because the mean of its divisors is an integer number (3175542594).

Almost surely, 2^12688854779 is an apocalyptic number.

12688854779 is a deficient number, since it is larger than the sum of its proper divisors (13315597).

12688854779 is an equidigital number, since it uses as much as digits as its factorization.

12688854779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13315596.

The product of its digits is 54190080, while the sum is 65.

The spelling of 12688854779 in words is "twelve billion, six hundred eighty-eight million, eight hundred fifty-four thousand, seven hundred seventy-nine".