19638483647 has 4 divisors (see below), whose sum is σ = 19639708200. Its totient is φ = 19637259096.

The previous prime is 19638483643. The next prime is 19638483653. The reversal of 19638483647 is 74638483691.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19638483647 - 2² = 19638483643 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 (19638483643) 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, 587897 + ... + 620402.

It is an arithmetic number, because the mean of its divisors is an integer number (4909927050).

Almost surely, 2^19638483647 is an apocalyptic number.

19638483647 is a deficient number, since it is larger than the sum of its proper divisors (1224553).

19638483647 is a wasteful number, since it uses less digits than its factorization.

19638483647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224552.

The product of its digits is 20901888, while the sum is 59.

The spelling of 19638483647 in words is "nineteen billion, six hundred thirty-eight million, four hundred eighty-three thousand, six hundred forty-seven".