19440097819 has 2 divisors, whose sum is σ = 19440097820. Its totient is φ = 19440097818.

The previous prime is 19440097801. The next prime is 19440097823. The reversal of 19440097819 is 91879004491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19440097819 - 2²³ = 19431709211 is a prime.

It is a super-2 number, since 2×19440097819² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19440097849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9720048909 + 9720048910.

It is an arithmetic number, because the mean of its divisors is an integer number (9720048910).

Almost surely, 2^19440097819 is an apocalyptic number.

19440097819 is a deficient number, since it is larger than the sum of its proper divisors (1).

19440097819 is an equidigital number, since it uses as much as digits as its factorization.

19440097819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 52.

The spelling of 19440097819 in words is "nineteen billion, four hundred forty million, ninety-seven thousand, eight hundred nineteen".