6445989740806 has 24 divisors (see below), whose sum is σ = 12146162490000. Its totient is φ = 2511424573680.

The previous prime is 6445989740791. The next prime is 6445989740807. The reversal of 6445989740806 is 6080479895446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6445989740807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1902592681 + ... + 1902596068.

It is an arithmetic number, because the mean of its divisors is an integer number (506090103750).

Almost surely, 2^{6445989740806} is an apocalyptic number.

6445989740806 is a deficient number, since it is larger than the sum of its proper divisors (5700172749194).

6445989740806 is a wasteful number, since it uses less digits than its factorization.

6445989740806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3805188780 (or 3805188769 counting only the distinct ones).

The product of its (nonzero) digits is 418037760, while the sum is 70.

The spelling of 6445989740806 in words is "six trillion, four hundred forty-five billion, nine hundred eighty-nine million, seven hundred forty thousand, eight hundred six".