19948194774719 has 2 divisors, whose sum is σ = 19948194774720. Its totient is φ = 19948194774718.

The previous prime is 19948194774691. The next prime is 19948194774791. The reversal of 19948194774719 is 91747749184991.

Together with next prime (19948194774791) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19948194774719 is a prime.

It is a super-2 number, since 2×19948194774719² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19948194774419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9974097387359 + 9974097387360.

It is an arithmetic number, because the mean of its divisors is an integer number (9974097387360).

Almost surely, 2^{19948194774719} is an apocalyptic number.

19948194774719 is a deficient number, since it is larger than the sum of its proper divisors (1).

19948194774719 is an equidigital number, since it uses as much as digits as its factorization.

19948194774719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152216576, while the sum is 80.

The spelling of 19948194774719 in words is "nineteen trillion, nine hundred forty-eight billion, one hundred ninety-four million, seven hundred seventy-four thousand, seven hundred nineteen".