12698689891 has 2 divisors, whose sum is σ = 12698689892. Its totient is φ = 12698689890.

The previous prime is 12698689849. The next prime is 12698689921. The reversal of 12698689891 is 19898689621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12698689891 - 2¹⁵ = 12698657123 is a prime.

It is a super-2 number, since 2×12698689891² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12698669891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6349344945 + 6349344946.

It is an arithmetic number, because the mean of its divisors is an integer number (6349344946).

Almost surely, 2^12698689891 is an apocalyptic number.

12698689891 is a deficient number, since it is larger than the sum of its proper divisors (1).

12698689891 is an equidigital number, since it uses as much as digits as its factorization.

12698689891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26873856, while the sum is 67.

The spelling of 12698689891 in words is "twelve billion, six hundred ninety-eight million, six hundred eighty-nine thousand, eight hundred ninety-one".