6601560561565 has 4 divisors (see below), whose sum is σ = 7921872673884. Its totient is φ = 5281248449248.

The previous prime is 6601560561523. The next prime is 6601560561577. The reversal of 6601560561565 is 5651650651066.

6601560561565 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4245915755844 + 2355644805721 = 2060562^2 + 1534811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6601560561565 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 660156056152 + ... + 660156056161.

It is an arithmetic number, because the mean of its divisors is an integer number (1980468168471).

Almost surely, 2^{6601560561565} is an apocalyptic number.

It is an amenable number.

6601560561565 is a deficient number, since it is larger than the sum of its proper divisors (1320312112319).

6601560561565 is a wasteful number, since it uses less digits than its factorization.

6601560561565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1320312112318.

The product of its (nonzero) digits is 4860000, while the sum is 52.

The spelling of 6601560561565 in words is "six trillion, six hundred one billion, five hundred sixty million, five hundred sixty-one thousand, five hundred sixty-five".