6648737378465 has 96 divisors (see below), whose sum is σ = 10389647471616. Its totient is φ = 3976953292800.

The previous prime is 6648737378447. The next prime is 6648737378473. The reversal of 6648737378465 is 5648737378466.

It is a de Polignac number, because none of the positive numbers 2^k-6648737378465 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6648737378392 and 6648737378401.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 65815784 + ... + 65916726.

It is an arithmetic number, because the mean of its divisors is an integer number (108225494496).

Almost surely, 2^{6648737378465} is an apocalyptic number.

6648737378465 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6648737378465 is a deficient number, since it is larger than the sum of its proper divisors (3740910093151).

6648737378465 is a wasteful number, since it uses less digits than its factorization.

6648737378465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101407 (or 101388 counting only the distinct ones).

The product of its digits is 3413975040, while the sum is 74.

Subtracting from 6648737378465 its reverse (5648737378466), we obtain a palindrome (999999999999).

The spelling of 6648737378465 in words is "six trillion, six hundred forty-eight billion, seven hundred thirty-seven million, three hundred seventy-eight thousand, four hundred sixty-five".