6500161665665 has 8 divisors (see below), whose sum is σ = 7817114162088. Its totient is φ = 5188849223680.

The previous prime is 6500161665661. The next prime is 6500161665689. The reversal of 6500161665665 is 5665661610056.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3739444801 + 6496422220864 = 61151^2 + 2548808^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6500161665665 - 2² = 6500161665661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6500161665661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1410011072 + ... + 1410015681.

It is an arithmetic number, because the mean of its divisors is an integer number (977139270261).

Almost surely, 2^{6500161665665} is an apocalyptic number.

It is an amenable number.

6500161665665 is a deficient number, since it is larger than the sum of its proper divisors (1316952496423).

6500161665665 is a wasteful number, since it uses less digits than its factorization.

6500161665665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2820027219.

The product of its (nonzero) digits is 5832000, while the sum is 53.

The spelling of 6500161665665 in words is "six trillion, five hundred billion, one hundred sixty-one million, six hundred sixty-five thousand, six hundred sixty-five".