6444818985 has 16 divisors (see below), whose sum is σ = 11249138880. Its totient is φ = 3124760640.

The previous prime is 6444818953. The next prime is 6444818999. The reversal of 6444818985 is 5898184446.

It is a happy number.

It is not a de Polignac number, because 6444818985 - 2⁵ = 6444818953 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19529590 + ... + 19529919.

It is an arithmetic number, because the mean of its divisors is an integer number (703071180).

Almost surely, 2^6444818985 is an apocalyptic number.

It is an amenable number.

6444818985 is a deficient number, since it is larger than the sum of its proper divisors (4804319895).

6444818985 is a wasteful number, since it uses less digits than its factorization.

6444818985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39059528.

The product of its digits is 8847360, while the sum is 57.

The square root of 6444818985 is about 80279.6299505672. The cubic root of 6444818985 is about 1860.9594411275.

The spelling of 6444818985 in words is "six billion, four hundred forty-four million, eight hundred eighteen thousand, nine hundred eighty-five".