6500656561 has 16 divisors (see below), whose sum is σ = 7826800000. Its totient is φ = 5274367488.

The previous prime is 6500656517. The next prime is 6500656583. The reversal of 6500656561 is 1656560056.

It is a cyclic number.

It is not a de Polignac number, because 6500656561 - 2¹³ = 6500648369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6500650561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146551 + ... + 185683.

It is an arithmetic number, because the mean of its divisors is an integer number (489175000).

Almost surely, 2^6500656561 is an apocalyptic number.

It is an amenable number.

6500656561 is a deficient number, since it is larger than the sum of its proper divisors (1326143439).

6500656561 is a wasteful number, since it uses less digits than its factorization.

6500656561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40408.

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 6500656561 is about 80626.6491986366. The cubic root of 6500656561 is about 1866.3184127356.

The spelling of 6500656561 in words is "six billion, five hundred million, six hundred fifty-six thousand, five hundred sixty-one".