19628144647 has 2 divisors, whose sum is σ = 19628144648. Its totient is φ = 19628144646.

The previous prime is 19628144629. The next prime is 19628144651. The reversal of 19628144647 is 74644182691.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19628144647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19628144594 and 19628144603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19628144687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9814072323 + 9814072324.

It is an arithmetic number, because the mean of its divisors is an integer number (9814072324).

Almost surely, 2^19628144647 is an apocalyptic number.

19628144647 is a deficient number, since it is larger than the sum of its proper divisors (1).

19628144647 is an equidigital number, since it uses as much as digits as its factorization.

19628144647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2322432, while the sum is 52.

The spelling of 19628144647 in words is "nineteen billion, six hundred twenty-eight million, one hundred forty-four thousand, six hundred forty-seven".