19434961647 has 6 divisors (see below), whose sum is σ = 28072722392. Its totient is φ = 12956641092.

The previous prime is 19434961633. The next prime is 19434961691. The reversal of 19434961647 is 74616943491.

19434961647 is a `hidden beast` number, since 1 + 94 + 3 + 496 + 1 + 64 + 7 = 666.

It is not a de Polignac number, because 19434961647 - 2⁶ = 19434961583 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19434961593 and 19434961602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19434961607) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1079720083 + ... + 1079720100.

Almost surely, 2^19434961647 is an apocalyptic number.

19434961647 is a deficient number, since it is larger than the sum of its proper divisors (8637760745).

19434961647 is a wasteful number, since it uses less digits than its factorization.

19434961647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2159440189 (or 2159440186 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The spelling of 19434961647 in words is "nineteen billion, four hundred thirty-four million, nine hundred sixty-one thousand, six hundred forty-seven".