6444488865 has 16 divisors (see below), whose sum is σ = 10319601600. Its totient is φ = 3434254272.

The previous prime is 6444488863. The next prime is 6444488881. The reversal of 6444488865 is 5688844446.

It is not a de Polignac number, because 6444488865 - 2¹ = 6444488863 is a prime.

It is a super-2 number, since 2×6444488865² = 83062873462217976450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6444488861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156355 + ... + 193224.

It is an arithmetic number, because the mean of its divisors is an integer number (644975100).

Almost surely, 2^6444488865 is an apocalyptic number.

It is an amenable number.

6444488865 is a deficient number, since it is larger than the sum of its proper divisors (3875112735).

6444488865 is a wasteful number, since it uses less digits than its factorization.

6444488865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350816.

The product of its digits is 23592960, while the sum is 57.

The square root of 6444488865 is about 80277.5738609482. The cubic root of 6444488865 is about 1860.9276662284.

The spelling of 6444488865 in words is "six billion, four hundred forty-four million, four hundred eighty-eight thousand, eight hundred sixty-five".