19778698642111 has 2 divisors, whose sum is σ = 19778698642112. Its totient is φ = 19778698642110.

The previous prime is 19778698642099. The next prime is 19778698642163. The reversal of 19778698642111 is 11124689687791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19778698642111 - 2⁹ = 19778698641599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19778698642181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9889349321055 + 9889349321056.

It is an arithmetic number, because the mean of its divisors is an integer number (9889349321056).

Almost surely, 2^{19778698642111} is an apocalyptic number.

19778698642111 is a deficient number, since it is larger than the sum of its proper divisors (1).

19778698642111 is an equidigital number, since it uses as much as digits as its factorization.

19778698642111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73156608, while the sum is 70.

The spelling of 19778698642111 in words is "nineteen trillion, seven hundred seventy-eight billion, six hundred ninety-eight million, six hundred forty-two thousand, one hundred eleven".