19912573478 has 16 divisors (see below), whose sum is σ = 34137845280. Its totient is φ = 8533458816.

The previous prime is 19912573453. The next prime is 19912573481. The reversal of 19912573478 is 87437521991.

19912573478 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 303518 + ... + 363246.

It is an arithmetic number, because the mean of its divisors is an integer number (2133615330).

Almost surely, 2^19912573478 is an apocalyptic number.

19912573478 is a deficient number, since it is larger than the sum of its proper divisors (14225271802).

19912573478 is a wasteful number, since it uses less digits than its factorization.

19912573478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83551.

The product of its digits is 3810240, while the sum is 56.

The spelling of 19912573478 in words is "nineteen billion, nine hundred twelve million, five hundred seventy-three thousand, four hundred seventy-eight".