13978661911 has 2 divisors, whose sum is σ = 13978661912. Its totient is φ = 13978661910.

The previous prime is 13978661909. The next prime is 13978661929. The reversal of 13978661911 is 11916687931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13978661911 - 2¹ = 13978661909 is a prime.

Together with 13978661909, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13978661951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6989330955 + 6989330956.

It is an arithmetic number, because the mean of its divisors is an integer number (6989330956).

Almost surely, 2^13978661911 is an apocalyptic number.

13978661911 is a deficient number, since it is larger than the sum of its proper divisors (1).

13978661911 is an equidigital number, since it uses as much as digits as its factorization.

13978661911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 52.

The spelling of 13978661911 in words is "thirteen billion, nine hundred seventy-eight million, six hundred sixty-one thousand, nine hundred eleven".