19619818879 has 2 divisors, whose sum is σ = 19619818880. Its totient is φ = 19619818878.

The previous prime is 19619818861. The next prime is 19619818919. The reversal of 19619818879 is 97881891691.

It is a weak prime.

It is an emirp because it is prime and its reverse (97881891691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19619818879 - 2⁹ = 19619818367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19619818819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9809909439 + 9809909440.

It is an arithmetic number, because the mean of its divisors is an integer number (9809909440).

Almost surely, 2^19619818879 is an apocalyptic number.

19619818879 is a deficient number, since it is larger than the sum of its proper divisors (1).

19619818879 is an equidigital number, since it uses as much as digits as its factorization.

19619818879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15676416, while the sum is 67.

The spelling of 19619818879 in words is "nineteen billion, six hundred nineteen million, eight hundred eighteen thousand, eight hundred seventy-nine".