19719895423 has 2 divisors, whose sum is σ = 19719895424. Its totient is φ = 19719895422.

The previous prime is 19719895379. The next prime is 19719895463. The reversal of 19719895423 is 32459891791.

It is a strong prime.

It is an emirp because it is prime and its reverse (32459891791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19719895423 - 2⁹ = 19719894911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19719895463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9859947711 + 9859947712.

It is an arithmetic number, because the mean of its divisors is an integer number (9859947712).

Almost surely, 2^19719895423 is an apocalyptic number.

19719895423 is a deficient number, since it is larger than the sum of its proper divisors (1).

19719895423 is an equidigital number, since it uses as much as digits as its factorization.

19719895423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4898880, while the sum is 58.

The spelling of 19719895423 in words is "nineteen billion, seven hundred nineteen million, eight hundred ninety-five thousand, four hundred twenty-three".