6401765436889 has 2 divisors, whose sum is σ = 6401765436890. Its totient is φ = 6401765436888.

The previous prime is 6401765436887. The next prime is 6401765436917. The reversal of 6401765436889 is 9886345671046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5537361985600 + 864403451289 = 2353160^2 + 929733^2 .

It is a cyclic number.

It is not a de Polignac number, because 6401765436889 - 2¹ = 6401765436887 is a prime.

Together with 6401765436887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6401765436887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3200882718444 + 3200882718445.

It is an arithmetic number, because the mean of its divisors is an integer number (3200882718445).

Almost surely, 2^{6401765436889} is an apocalyptic number.

It is an amenable number.

6401765436889 is a deficient number, since it is larger than the sum of its proper divisors (1).

6401765436889 is an equidigital number, since it uses as much as digits as its factorization.

6401765436889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209018880, while the sum is 67.

The spelling of 6401765436889 in words is "six trillion, four hundred one billion, seven hundred sixty-five million, four hundred thirty-six thousand, eight hundred eighty-nine".