19999144259 has 2 divisors, whose sum is σ = 19999144260. Its totient is φ = 19999144258.

The previous prime is 19999144223. The next prime is 19999144261. The reversal of 19999144259 is 95244199991.

It is a strong prime.

It is an emirp because it is prime and its reverse (95244199991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19999144259 is a prime.

Together with 19999144261, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19999144219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9999572129 + 9999572130.

It is an arithmetic number, because the mean of its divisors is an integer number (9999572130).

Almost surely, 2^19999144259 is an apocalyptic number.

19999144259 is a deficient number, since it is larger than the sum of its proper divisors (1).

19999144259 is an equidigital number, since it uses as much as digits as its factorization.

19999144259 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9447840, while the sum is 62.

The spelling of 19999144259 in words is "nineteen billion, nine hundred ninety-nine million, one hundred forty-four thousand, two hundred fifty-nine".