6499664786 has 16 divisors (see below), whose sum is σ = 10065995520. Its totient is φ = 3144374640.

The previous prime is 6499664779. The next prime is 6499664789. The reversal of 6499664786 is 6874669946.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6499664789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 523280 + ... + 535556.

It is an arithmetic number, because the mean of its divisors is an integer number (629124720).

Almost surely, 2^6499664786 is an apocalyptic number.

6499664786 is a deficient number, since it is larger than the sum of its proper divisors (3566330734).

6499664786 is a wasteful number, since it uses less digits than its factorization.

6499664786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20849.

The product of its digits is 94058496, while the sum is 65.

The square root of 6499664786 is about 80620.4985472057. The cubic root of 6499664786 is about 1866.2234960624.

The spelling of 6499664786 in words is "six billion, four hundred ninety-nine million, six hundred sixty-four thousand, seven hundred eighty-six".