6344641656 has 64 divisors (see below), whose sum is σ = 17750880000. Its totient is φ = 2099655648.

The previous prime is 6344641651. The next prime is 6344641679. The reversal of 6344641656 is 6561464436.

6344641656 is a `hidden beast` number, since 634 + 4 + 6 + 4 + 1 + 6 + 5 + 6 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6344641651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75636 + ... + 135683.

It is an arithmetic number, because the mean of its divisors is an integer number (277357500).

Almost surely, 2^6344641656 is an apocalyptic number.

It is an amenable number.

6344641656 is an abundant number, since it is smaller than the sum of its proper divisors (11406238344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6344641656 is a wasteful number, since it uses less digits than its factorization.

6344641656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211473 (or 211463 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 45.

The square root of 6344641656 is about 79653.2589163808. The cubic root of 6344641656 is about 1851.2668854369.

The spelling of 6344641656 in words is "six billion, three hundred forty-four million, six hundred forty-one thousand, six hundred fifty-six".