19917875443 has 2 divisors, whose sum is σ = 19917875444. Its totient is φ = 19917875442.

The previous prime is 19917875423. The next prime is 19917875459. The reversal of 19917875443 is 34457871991.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (34457871991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19917875443 - 2²⁵ = 19884321011 is a prime.

It is not a weakly prime, because it can be changed into another prime (19917875423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9958937721 + 9958937722.

It is an arithmetic number, because the mean of its divisors is an integer number (9958937722).

Almost surely, 2^19917875443 is an apocalyptic number.

19917875443 is a deficient number, since it is larger than the sum of its proper divisors (1).

19917875443 is an equidigital number, since it uses as much as digits as its factorization.

19917875443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7620480, while the sum is 58.

The spelling of 19917875443 in words is "nineteen billion, nine hundred seventeen million, eight hundred seventy-five thousand, four hundred forty-three".