12891335678 has 16 divisors (see below), whose sum is σ = 21496223616. Its totient is φ = 5757916320.

The previous prime is 12891335659. The next prime is 12891335683. The reversal of 12891335678 is 87653319821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7996301 + ... + 7997912.

It is an arithmetic number, because the mean of its divisors is an integer number (1343513976).

Almost surely, 2^12891335678 is an apocalyptic number.

12891335678 is a deficient number, since it is larger than the sum of its proper divisors (8604887938).

12891335678 is a wasteful number, since it uses less digits than its factorization.

12891335678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15994259.

The product of its digits is 2177280, while the sum is 53.

The spelling of 12891335678 in words is "twelve billion, eight hundred ninety-one million, three hundred thirty-five thousand, six hundred seventy-eight".