19447464871 has 4 divisors (see below), whose sum is σ = 19571334232. Its totient is φ = 19323595512.

The previous prime is 19447464863. The next prime is 19447464889. The reversal of 19447464871 is 17846474491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17846474491 = 62473 ⋅285667.

It is a cyclic number.

It is not a de Polignac number, because 19447464871 - 2³ = 19447464863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19447464811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61934445 + ... + 61934758.

It is an arithmetic number, because the mean of its divisors is an integer number (4892833558).

Almost surely, 2^19447464871 is an apocalyptic number.

19447464871 is a deficient number, since it is larger than the sum of its proper divisors (123869361).

19447464871 is a wasteful number, since it uses less digits than its factorization.

19447464871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123869360.

The product of its digits is 5419008, while the sum is 55.

The spelling of 19447464871 in words is "nineteen billion, four hundred forty-seven million, four hundred sixty-four thousand, eight hundred seventy-one".