18680064647 has 2 divisors, whose sum is σ = 18680064648. Its totient is φ = 18680064646.

The previous prime is 18680064619. The next prime is 18680064649. The reversal of 18680064647 is 74646008681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18680064647 - 2¹⁴ = 18680048263 is a prime.

Together with 18680064649, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18680064595 and 18680064604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18680064649) 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, 9340032323 + 9340032324.

It is an arithmetic number, because the mean of its divisors is an integer number (9340032324).

Almost surely, 2^18680064647 is an apocalyptic number.

18680064647 is a deficient number, since it is larger than the sum of its proper divisors (1).

18680064647 is an equidigital number, since it uses as much as digits as its factorization.

18680064647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1548288, while the sum is 50.

The spelling of 18680064647 in words is "eighteen billion, six hundred eighty million, sixty-four thousand, six hundred forty-seven".