19643284147 has 4 divisors (see below), whose sum is σ = 19673366400. Its totient is φ = 19613201896.

The previous prime is 19643284139. The next prime is 19643284207. The reversal of 19643284147 is 74148234691.

It is a happy number.

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 19643284147 - 2³ = 19643284139 is a prime.

It is a super-2 number, since 2×19643284147² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19643284147.

It is not an unprimeable number, because it can be changed into a prime (19643284847) 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, 15040147 + ... + 15041452.

It is an arithmetic number, because the mean of its divisors is an integer number (4918341600).

Almost surely, 2^19643284147 is an apocalyptic number.

19643284147 is a deficient number, since it is larger than the sum of its proper divisors (30082253).

19643284147 is an equidigital number, since it uses as much as digits as its factorization.

19643284147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30082252.

The product of its digits is 1161216, while the sum is 49.

The spelling of 19643284147 in words is "nineteen billion, six hundred forty-three million, two hundred eighty-four thousand, one hundred forty-seven".