6448615665 has 16 divisors (see below), whose sum is σ = 10471783488. Its totient is φ = 3387928896.

The previous prime is 6448615609. The next prime is 6448615687. The reversal of 6448615665 is 5665168446.

It is a happy number.

It is not a de Polignac number, because 6448615665 - 2¹¹ = 6448613617 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3207262 + ... + 3209271.

It is an arithmetic number, because the mean of its divisors is an integer number (654486468).

Almost surely, 2^6448615665 is an apocalyptic number.

It is an amenable number.

6448615665 is a deficient number, since it is larger than the sum of its proper divisors (4023167823).

6448615665 is a wasteful number, since it uses less digits than its factorization.

6448615665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6416608.

The product of its digits is 4147200, while the sum is 51.

The square root of 6448615665 is about 80303.2730652992. The cubic root of 6448615665 is about 1861.3248033679.

The spelling of 6448615665 in words is "six billion, four hundred forty-eight million, six hundred fifteen thousand, six hundred sixty-five".