6646775744 has 56 divisors (see below), whose sum is σ = 15329489280. Its totient is φ = 2800325376.

The previous prime is 6646775713. The next prime is 6646775747. The reversal of 6646775744 is 4475776466.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a self number, because there is not a number n which added to its sum of digits gives 6646775744.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6646775747) 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 7 ways as a sum of consecutive naturals, for example, 99302 + ... + 152165.

It is an arithmetic number, because the mean of its divisors is an integer number (273740880).

Almost surely, 2^6646775744 is an apocalyptic number.

6646775744 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

6646775744 is an abundant number, since it is smaller than the sum of its proper divisors (8682713536).

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

6646775744 is a wasteful number, since it uses less digits than its factorization.

6646775744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251545 (or 251535 counting only the distinct ones).

The product of its digits is 23708160, while the sum is 56.

The square root of 6646775744 is about 81527.7605727031. The cubic root of 6646775744 is about 1880.1983855836.

The spelling of 6646775744 in words is "six billion, six hundred forty-six million, seven hundred seventy-five thousand, seven hundred forty-four".