6561765072656 has 20 divisors (see below), whose sum is σ = 12733567898304. Its totient is φ = 3275683034400.

The previous prime is 6561765072613. The next prime is 6561765072661. The reversal of 6561765072656 is 6562705671656.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 324958460 + ... + 324978651.

Almost surely, 2^{6561765072656} is an apocalyptic number.

It is an amenable number.

6561765072656 is a deficient number, since it is larger than the sum of its proper divisors (6171802825648).

6561765072656 is a wasteful number, since it uses less digits than its factorization.

6561765072656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649937750 (or 649937744 counting only the distinct ones).

The product of its (nonzero) digits is 95256000, while the sum is 62.

The spelling of 6561765072656 in words is "six trillion, five hundred sixty-one billion, seven hundred sixty-five million, seventy-two thousand, six hundred fifty-six".