6445989741769 has 2 divisors, whose sum is σ = 6445989741770. Its totient is φ = 6445989741768.

The previous prime is 6445989741761. The next prime is 6445989741809. The reversal of 6445989741769 is 9671479895446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5938540095744 + 507449646025 = 2436912^2 + 712355^2 .

It is a cyclic number.

It is not a de Polignac number, because 6445989741769 - 2³ = 6445989741761 is a prime.

It is a super-2 number, since 2×6445989741769² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6445989741761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3222994870884 + 3222994870885.

It is an arithmetic number, because the mean of its divisors is an integer number (3222994870885).

Almost surely, 2^{6445989741769} is an apocalyptic number.

It is an amenable number.

6445989741769 is a deficient number, since it is larger than the sum of its proper divisors (1).

6445989741769 is an equidigital number, since it uses as much as digits as its factorization.

6445989741769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3292047360, while the sum is 79.

The spelling of 6445989741769 in words is "six trillion, four hundred forty-five billion, nine hundred eighty-nine million, seven hundred forty-one thousand, seven hundred sixty-nine".