6445989740807 has 2 divisors, whose sum is σ = 6445989740808. Its totient is φ = 6445989740806.

The previous prime is 6445989740791. The next prime is 6445989740933. The reversal of 6445989740807 is 7080479895446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6445989740807 - 2⁴ = 6445989740791 is a prime.

It is a super-2 number, since 2×6445989740807² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6445989740507) 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, 3222994870403 + 3222994870404.

It is an arithmetic number, because the mean of its divisors is an integer number (3222994870404).

Almost surely, 2^{6445989740807} is an apocalyptic number.

6445989740807 is a deficient number, since it is larger than the sum of its proper divisors (1).

6445989740807 is an equidigital number, since it uses as much as digits as its factorization.

6445989740807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 487710720, while the sum is 71.

The spelling of 6445989740807 in words is "six trillion, four hundred forty-five billion, nine hundred eighty-nine million, seven hundred forty thousand, eight hundred seven".