19786842479 has 2 divisors, whose sum is σ = 19786842480. Its totient is φ = 19786842478.

The previous prime is 19786842463. The next prime is 19786842511. The reversal of 19786842479 is 97424868791.

It is a weak prime.

It is an emirp because it is prime and its reverse (97424868791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19786842479 - 2⁴ = 19786842463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19786842379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9893421239 + 9893421240.

It is an arithmetic number, because the mean of its divisors is an integer number (9893421240).

Almost surely, 2^19786842479 is an apocalyptic number.

19786842479 is a deficient number, since it is larger than the sum of its proper divisors (1).

19786842479 is an equidigital number, since it uses as much as digits as its factorization.

19786842479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48771072, while the sum is 65.

The spelling of 19786842479 in words is "nineteen billion, seven hundred eighty-six million, eight hundred forty-two thousand, four hundred seventy-nine".