63989915013911 has 2 divisors, whose sum is σ = 63989915013912. Its totient is φ = 63989915013910.

The previous prime is 63989915013859. The next prime is 63989915013949. The reversal of 63989915013911 is 11931051998936.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63989915013911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63989915013991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31994957506955 + 31994957506956.

It is an arithmetic number, because the mean of its divisors is an integer number (31994957506956).

Almost surely, 2^{63989915013911} is an apocalyptic number.

63989915013911 is a deficient number, since it is larger than the sum of its proper divisors (1).

63989915013911 is an equidigital number, since it uses as much as digits as its factorization.

63989915013911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14171760, while the sum is 65.

The spelling of 63989915013911 in words is "sixty-three trillion, nine hundred eighty-nine billion, nine hundred fifteen million, thirteen thousand, nine hundred eleven".