6445989741870 has 80 divisors (see below), whose sum is σ = 19808628811488. Its totient is φ = 1473369082560.

The previous prime is 6445989741859. The next prime is 6445989741871. The reversal of 6445989741870 is 781479895446.

6445989741870 is a `hidden beast` number, since 6 + 4 + 4 + 59 + 8 + 97 + 418 + 70 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6445989741871) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 568423761 + ... + 568435100.

Almost surely, 2^{6445989741870} is an apocalyptic number.

6445989741870 is an abundant number, since it is smaller than the sum of its proper divisors (13362639069618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6445989741870 is a wasteful number, since it uses less digits than its factorization.

6445989741870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136858887 (or 1136858878 counting only the distinct ones).

The product of its (nonzero) digits is 487710720, while the sum is 72.

The spelling of 6445989741870 in words is "six trillion, four hundred forty-five billion, nine hundred eighty-nine million, seven hundred forty-one thousand, eight hundred seventy".