66560501561165 has 16 divisors (see below), whose sum is σ = 84582715799088. Its totient is φ = 50109193860096.

The previous prime is 66560501561161. The next prime is 66560501561209. The reversal of 66560501561165 is 56116510506566.

66560501561165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 5457185667844 + 61103315893321 = 2336062^2 + 7816861^2 .

It is a cyclic number.

It is not a de Polignac number, because 66560501561165 - 2² = 66560501561161 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66560501561161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53668382 + ... + 54894591.

It is an arithmetic number, because the mean of its divisors is an integer number (5286419737443).

Almost surely, 2^{66560501561165} is an apocalyptic number.

It is an amenable number.

66560501561165 is a deficient number, since it is larger than the sum of its proper divisors (18022214237923).

66560501561165 is a wasteful number, since it uses less digits than its factorization.

66560501561165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108570208.

The product of its (nonzero) digits is 4860000, while the sum is 53.

The spelling of 66560501561165 in words is "sixty-six trillion, five hundred sixty billion, five hundred one million, five hundred sixty-one thousand, one hundred sixty-five".