63955431761789 has 2 divisors, whose sum is σ = 63955431761790. Its totient is φ = 63955431761788.

The previous prime is 63955431761783. The next prime is 63955431761827. The reversal of 63955431761789 is 98716713455936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60975951864100 + 2979479897689 = 7808710^2 + 1726117^2 .

It is a cyclic number.

It is not a de Polignac number, because 63955431761789 - 2⁴ = 63955431761773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63955431761783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31977715880894 + 31977715880895.

It is an arithmetic number, because the mean of its divisors is an integer number (31977715880895).

Almost surely, 2^{63955431761789} is an apocalyptic number.

It is an amenable number.

63955431761789 is a deficient number, since it is larger than the sum of its proper divisors (1).

63955431761789 is an equidigital number, since it uses as much as digits as its factorization.

63955431761789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1028764800, while the sum is 74.

The spelling of 63955431761789 in words is "sixty-three trillion, nine hundred fifty-five billion, four hundred thirty-one million, seven hundred sixty-one thousand, seven hundred eighty-nine".