6445989740791 has 2 divisors, whose sum is σ = 6445989740792. Its totient is φ = 6445989740790.

The previous prime is 6445989740779. The next prime is 6445989740807. The reversal of 6445989740791 is 1970479895446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6445989740791 - 2¹¹ = 6445989738743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6445989740731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3222994870395 + 3222994870396.

It is an arithmetic number, because the mean of its divisors is an integer number (3222994870396).

Almost surely, 2^{6445989740791} is an apocalyptic number.

6445989740791 is a deficient number, since it is larger than the sum of its proper divisors (1).

6445989740791 is an equidigital number, since it uses as much as digits as its factorization.

6445989740791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 548674560, while the sum is 73.

The spelling of 6445989740791 in words is "six trillion, four hundred forty-five billion, nine hundred eighty-nine million, seven hundred forty thousand, seven hundred ninety-one".