6649388398064 has 40 divisors (see below), whose sum is σ = 12917518583040. Its totient is φ = 3315846990528.

The previous prime is 6649388398057. The next prime is 6649388398067. The reversal of 6649388398064 is 4608938839466.

It is a junction number, because it is equal to n+sod(n) for n = 6649388397982 and 6649388398000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6649388398067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8686427 + ... + 9420869.

It is an arithmetic number, because the mean of its divisors is an integer number (322937964576).

Almost surely, 2^{6649388398064} is an apocalyptic number.

It is an amenable number.

6649388398064 is a deficient number, since it is larger than the sum of its proper divisors (6268130184976).

6649388398064 is a wasteful number, since it uses less digits than its factorization.

6649388398064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735957 (or 735951 counting only the distinct ones).

The product of its (nonzero) digits is 1289945088, while the sum is 74.

The spelling of 6649388398064 in words is "six trillion, six hundred forty-nine billion, three hundred eighty-eight million, three hundred ninety-eight thousand, sixty-four".