19406664049919 has 2 divisors, whose sum is σ = 19406664049920. Its totient is φ = 19406664049918.

The previous prime is 19406664049889. The next prime is 19406664049937. The reversal of 19406664049919 is 91994046660491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19406664049919 - 2⁴⁴ = 1814478005503 is a prime.

It is a super-2 number, since 2×19406664049919² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19406664079919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9703332024959 + 9703332024960.

It is an arithmetic number, because the mean of its divisors is an integer number (9703332024960).

Almost surely, 2^{19406664049919} is an apocalyptic number.

19406664049919 is a deficient number, since it is larger than the sum of its proper divisors (1).

19406664049919 is an equidigital number, since it uses as much as digits as its factorization.

19406664049919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90699264, while the sum is 68.

The spelling of 19406664049919 in words is "nineteen trillion, four hundred six billion, six hundred sixty-four million, forty-nine thousand, nine hundred nineteen".