19678731198719 has 2 divisors, whose sum is σ = 19678731198720. Its totient is φ = 19678731198718.

The previous prime is 19678731198713. The next prime is 19678731198793. The reversal of 19678731198719 is 91789113787691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19678731198719 - 2⁴ = 19678731198703 is a prime.

It is a super-2 number, since 2×19678731198719² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19678731198719.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19678731198713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9839365599359 + 9839365599360.

It is an arithmetic number, because the mean of its divisors is an integer number (9839365599360).

Almost surely, 2^{19678731198719} is an apocalyptic number.

19678731198719 is a deficient number, since it is larger than the sum of its proper divisors (1).

19678731198719 is an equidigital number, since it uses as much as digits as its factorization.

19678731198719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288054144, while the sum is 77.

The spelling of 19678731198719 in words is "nineteen trillion, six hundred seventy-eight billion, seven hundred thirty-one million, one hundred ninety-eight thousand, seven hundred nineteen".