63440986789 has 2 divisors, whose sum is σ = 63440986790. Its totient is φ = 63440986788.

The previous prime is 63440986787. The next prime is 63440986799. The reversal of 63440986789 is 98768904436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53091993889 + 10348992900 = 230417^2 + 101730^2 .

It is a cyclic number.

It is not a de Polignac number, because 63440986789 - 2¹ = 63440986787 is a prime.

Together with 63440986787, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 63440986789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63440986787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31720493394 + 31720493395.

It is an arithmetic number, because the mean of its divisors is an integer number (31720493395).

Almost surely, 2^63440986789 is an apocalyptic number.

It is an amenable number.

63440986789 is a deficient number, since it is larger than the sum of its proper divisors (1).

63440986789 is an equidigital number, since it uses as much as digits as its factorization.

63440986789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62705664, while the sum is 64.

The spelling of 63440986789 in words is "sixty-three billion, four hundred forty million, nine hundred eighty-six thousand, seven hundred eighty-nine".