6561506110665 has 32 divisors (see below), whose sum is σ = 11458000613376. Its totient is φ = 3179894644160.

The previous prime is 6561506110651. The next prime is 6561506110771. The reversal of 6561506110665 is 5660116051656.

6561506110665 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6561506110665 - 2¹⁷ = 6561505979593 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8645067 + ... + 9373376.

It is an arithmetic number, because the mean of its divisors is an integer number (358062519168).

Almost surely, 2^{6561506110665} is an apocalyptic number.

It is an amenable number.

6561506110665 is a deficient number, since it is larger than the sum of its proper divisors (4896494502711).

6561506110665 is a wasteful number, since it uses less digits than its factorization.

6561506110665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18020669.

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 6561506110665 in words is "six trillion, five hundred sixty-one billion, five hundred six million, one hundred ten thousand, six hundred sixty-five".