63910701989 has 2 divisors, whose sum is σ = 63910701990. Its totient is φ = 63910701988.

The previous prime is 63910701947. The next prime is 63910701991. The reversal of 63910701989 is 98910701936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40166973889 + 23743728100 = 200417^2 + 154090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63910701989 is a prime.

It is a super-2 number, since 2×63910701989² (a number of 22 digits) contains 22 as substring.

Together with 63910701991, 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 63910701989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63910701919) 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, 31955350994 + 31955350995.

It is an arithmetic number, because the mean of its divisors is an integer number (31955350995).

Almost surely, 2^63910701989 is an apocalyptic number.

It is an amenable number.

63910701989 is a deficient number, since it is larger than the sum of its proper divisors (1).

63910701989 is an equidigital number, since it uses as much as digits as its factorization.

63910701989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 734832, while the sum is 53.

Subtracting from 63910701989 its sum of digits (53), we obtain a palindrome (63910701936).

The spelling of 63910701989 in words is "sixty-three billion, nine hundred ten million, seven hundred one thousand, nine hundred eighty-nine".