19678791447 has 12 divisors (see below), whose sum is σ = 32485624080. Its totient is φ = 11245023648.

The previous prime is 19678791331. The next prime is 19678791449. The reversal of 19678791447 is 74419787691.

It is not a de Polignac number, because 19678791447 - 2¹⁴ = 19678775063 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 312361769 = 19678791447 / (1 + 9 + 6 + 7 + 8 + 7 + 9 + 1 + 4 + 4 + 7).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19678791449) 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 in 11 ways as a sum of consecutive naturals, for example, 156180822 + ... + 156180947.

It is an arithmetic number, because the mean of its divisors is an integer number (2707135340).

Almost surely, 2^19678791447 is an apocalyptic number.

19678791447 is a deficient number, since it is larger than the sum of its proper divisors (12806832633).

19678791447 is a wasteful number, since it uses less digits than its factorization.

19678791447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312361782 (or 312361779 counting only the distinct ones).

The product of its digits is 21337344, while the sum is 63.

The spelling of 19678791447 in words is "nineteen billion, six hundred seventy-eight million, seven hundred ninety-one thousand, four hundred forty-seven".