19847474847 has 32 divisors (see below), whose sum is σ = 30697920000. Its totient is φ = 12649830336.

The previous prime is 19847474837. The next prime is 19847474903. The reversal of 19847474847 is 74847474891.

19847474847 is a `hidden beast` number, since 1 + 9 + 84 + 7 + 474 + 84 + 7 = 666.

It is not a de Polignac number, because 19847474847 - 2⁷ = 19847474719 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19847474837) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1385779 + ... + 1400027.

It is an arithmetic number, because the mean of its divisors is an integer number (959310000).

Almost surely, 2^19847474847 is an apocalyptic number.

19847474847 is a deficient number, since it is larger than the sum of its proper divisors (10850445153).

19847474847 is a wasteful number, since it uses less digits than its factorization.

19847474847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16524 (or 16518 counting only the distinct ones).

The product of its digits is 50577408, while the sum is 63.

The spelling of 19847474847 in words is "nineteen billion, eight hundred forty-seven million, four hundred seventy-four thousand, eight hundred forty-seven".