6546640651 has 16 divisors (see below), whose sum is σ = 6794726400. Its totient is φ = 6303181248.

The previous prime is 6546640631. The next prime is 6546640691. The reversal of 6546640651 is 1560466456.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6546640651 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6546640598 and 6546640607.

It is not an unprimeable number, because it can be changed into a prime (6546640631) 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, 2848935 + ... + 2851231.

It is an arithmetic number, because the mean of its divisors is an integer number (424670400).

Almost surely, 2^6546640651 is an apocalyptic number.

6546640651 is a deficient number, since it is larger than the sum of its proper divisors (248085749).

6546640651 is a wasteful number, since it uses less digits than its factorization.

6546640651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3258.

The product of its (nonzero) digits is 518400, while the sum is 43.

The square root of 6546640651 is about 80911.3134919957. The cubic root of 6546640651 is about 1870.7087070390.

The spelling of 6546640651 in words is "six billion, five hundred forty-six million, six hundred forty thousand, six hundred fifty-one".