19743185478 has 16 divisors (see below), whose sum is σ = 39848632560. Its totient is φ = 6520684896.

The previous prime is 19743185453. The next prime is 19743185521. The reversal of 19743185478 is 87458134791.

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, 15093525 + ... + 15094832.

It is an arithmetic number, because the mean of its divisors is an integer number (2490539535).

Almost surely, 2^19743185478 is an apocalyptic number.

19743185478 is an abundant number, since it is smaller than the sum of its proper divisors (20105447082).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19743185478 is a wasteful number, since it uses less digits than its factorization.

19743185478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30188471.

The product of its digits is 6773760, while the sum is 57.

The spelling of 19743185478 in words is "nineteen billion, seven hundred forty-three million, one hundred eighty-five thousand, four hundred seventy-eight".