6646380783 has 16 divisors (see below), whose sum is σ = 10318910976. Its totient is φ = 3726272160.

The previous prime is 6646380751. The next prime is 6646380803. The reversal of 6646380783 is 3870836466.

It is a happy number.

It is not a de Polignac number, because 6646380783 - 2⁵ = 6646380751 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6646380383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2984683 + ... + 2986908.

It is an arithmetic number, because the mean of its divisors is an integer number (644931936).

Almost surely, 2^6646380783 is an apocalyptic number.

6646380783 is a deficient number, since it is larger than the sum of its proper divisors (3672530193).

6646380783 is a wasteful number, since it uses less digits than its factorization.

6646380783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5971654.

The product of its (nonzero) digits is 3483648, while the sum is 51.

The square root of 6646380783 is about 81525.3382881666. The cubic root of 6646380783 is about 1880.1611434794.

The spelling of 6646380783 in words is "six billion, six hundred forty-six million, three hundred eighty thousand, seven hundred eighty-three".