6499866650 has 12 divisors (see below), whose sum is σ = 12089752062. Its totient is φ = 2599946640.

The previous prime is 6499866643. The next prime is 6499866673. The reversal of 6499866650 is 566689946.

It can be written as a sum of positive squares in 3 ways, for example, as 5634153721 + 865712929 = 75061^2 + 29423^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6499866650.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 64998617 + ... + 64998716.

Almost surely, 2^6499866650 is an apocalyptic number.

6499866650 is a deficient number, since it is larger than the sum of its proper divisors (5589885412).

6499866650 is a wasteful number, since it uses less digits than its factorization.

6499866650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129997345 (or 129997340 counting only the distinct ones).

The product of its (nonzero) digits is 16796160, while the sum is 59.

The square root of 6499866650 is about 80621.7504771510. The cubic root of 6499866650 is about 1866.2428160044.

The spelling of 6499866650 in words is "six billion, four hundred ninety-nine million, eight hundred sixty-six thousand, six hundred fifty".