63978998385611 has 2 divisors, whose sum is σ = 63978998385612. Its totient is φ = 63978998385610.

The previous prime is 63978998385551. The next prime is 63978998385613. The reversal of 63978998385611 is 11658389987936.

63978998385611 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63978998385611 - 2¹⁴ = 63978998369227 is a prime.

It is a Sophie Germain prime.

Together with 63978998385613, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63978998385611.

It is not a weakly prime, because it can be changed into another prime (63978998385613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31989499192805 + 31989499192806.

It is an arithmetic number, because the mean of its divisors is an integer number (31989499192806).

Almost surely, 2^{63978998385611} is an apocalyptic number.

63978998385611 is a deficient number, since it is larger than the sum of its proper divisors (1).

63978998385611 is an equidigital number, since it uses as much as digits as its factorization.

63978998385611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4232632320, while the sum is 83.

The spelling of 63978998385611 in words is "sixty-three trillion, nine hundred seventy-eight billion, nine hundred ninety-eight million, three hundred eighty-five thousand, six hundred eleven".