19484198647 has 4 divisors (see below), whose sum is σ = 20112721216. Its totient is φ = 18855676080.

The previous prime is 19484198611. The next prime is 19484198677. The reversal of 19484198647 is 74689148491.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19484198647 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 (19484198677) 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, 314261238 + ... + 314261299.

It is an arithmetic number, because the mean of its divisors is an integer number (5028180304).

Almost surely, 2^19484198647 is an apocalyptic number.

19484198647 is a deficient number, since it is larger than the sum of its proper divisors (628522569).

19484198647 is an equidigital number, since it uses as much as digits as its factorization.

19484198647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628522568.

The product of its digits is 13934592, while the sum is 61.

The spelling of 19484198647 in words is "nineteen billion, four hundred eighty-four million, one hundred ninety-eight thousand, six hundred forty-seven".