19817706919 has 2 divisors, whose sum is σ = 19817706920. Its totient is φ = 19817706918.

The previous prime is 19817706911. The next prime is 19817706941. The reversal of 19817706919 is 91960771891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19817706919 - 2³ = 19817706911 is a prime.

It is a super-2 number, since 2×19817706919² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19817706911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9908853459 + 9908853460.

It is an arithmetic number, because the mean of its divisors is an integer number (9908853460).

Almost surely, 2^19817706919 is an apocalyptic number.

19817706919 is a deficient number, since it is larger than the sum of its proper divisors (1).

19817706919 is an equidigital number, since it uses as much as digits as its factorization.

19817706919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1714608, while the sum is 58.

The spelling of 19817706919 in words is "nineteen billion, eight hundred seventeen million, seven hundred six thousand, nine hundred nineteen".