19478387547 has 16 divisors (see below), whose sum is σ = 28859020960. Its totient is φ = 12984624000.

The previous prime is 19478387531. The next prime is 19478387561. The reversal of 19478387547 is 74578387491.

19478387547 is a `hidden beast` number, since 1 + 9 + 4 + 7 + 8 + 3 + 87 + 547 = 666.

It is not a de Polignac number, because 19478387547 - 2⁴ = 19478387531 is a prime.

It is a super-2 number, since 2×19478387547² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (19478385547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 682647 + ... + 710607.

It is an arithmetic number, because the mean of its divisors is an integer number (1803688810).

Almost surely, 2^19478387547 is an apocalyptic number.

19478387547 is a deficient number, since it is larger than the sum of its proper divisors (9380633413).

19478387547 is a wasteful number, since it uses less digits than its factorization.

19478387547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53771 (or 53765 counting only the distinct ones).

The product of its digits is 47416320, while the sum is 63.

The spelling of 19478387547 in words is "nineteen billion, four hundred seventy-eight million, three hundred eighty-seven thousand, five hundred forty-seven".