12891036779 has 16 divisors (see below), whose sum is σ = 13289633280. Its totient is φ = 12497170560.

The previous prime is 12891036733. The next prime is 12891036793. The reversal of 12891036779 is 97763019821.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12891036779 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12891036779.

It is not an unprimeable number, because it can be changed into a prime (12891036679) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9471059 + ... + 9472419.

It is an arithmetic number, because the mean of its divisors is an integer number (830602080).

Almost surely, 2^12891036779 is an apocalyptic number.

12891036779 is a deficient number, since it is larger than the sum of its proper divisors (398596501).

12891036779 is a wasteful number, since it uses less digits than its factorization.

12891036779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2890.

The product of its (nonzero) digits is 1143072, while the sum is 53.

The spelling of 12891036779 in words is "twelve billion, eight hundred ninety-one million, thirty-six thousand, seven hundred seventy-nine".